このチュートリアルでは、カスタム HTML 要素を使用して、マーカーが配置された Google マップをウェブページに追加する方法を説明します。このチュートリアルでは、2 つのマーカーが（1 つはカリフォルニア州マウンテンビューに、もう 1 つはワシントン州シアトルに）配置されている地図を作成します。
始める
マーカーが配置された Google マップを、HTML を使ってウェブページに追加する手順は次のとおりです。
<html> <head> <title>Add a Map with Markers using HTML</title> <link rel="stylesheet" type="text/css" href="./style.css" /> <script type="module" src="./index.js"></script> </head> <body> <gmp-map center="43.4142989,-124.2301242" zoom="4" map-id="DEMO_MAP_ID" style="height: 400px" > <gmp-advanced-marker position="37.4220656,-122.0840897" title="Mountain View, CA" ></gmp-advanced-marker> <gmp-advanced-marker position="47.648994,-122.3503845" title="Seattle, WA" ></gmp-advanced-marker> </gmp-map> <!-- The `defer` attribute causes the script to execute after the full HTML document has been parsed. For non-blocking uses, avoiding race conditions, and consistent behavior across browsers, consider loading using Promises. See https://developers.google.com/maps/documentation/javascript/load-maps-js-api for more information. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&libraries=maps,marker&v=beta" defer ></script> </body> </html>
[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["必要な情報がない","missingTheInformationINeed","thumb-down"],["複雑すぎる / 手順が多すぎる","tooComplicatedTooManySteps","thumb-down"],["最新ではない","outOfDate","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["サンプル / コードに問題がある","samplesCodeIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-08-12 UTC。"],[[["\u003cp\u003eThis tutorial demonstrates how to add a Google map with markers to a webpage using HTML and the Maps JavaScript API.\u003c/p\u003e\n"],["\u003cp\u003eYou will need to obtain an API key from the Google Cloud console and enable billing for the project.\u003c/p\u003e\n"],["\u003cp\u003eThe tutorial provides code snippets for creating the HTML structure, adding the map, and placing markers at specific locations.\u003c/p\u003e\n"],["\u003cp\u003eCustomization options are available, such as custom styling and using the Geocoding service to convert addresses into coordinates.\u003c/p\u003e\n"]]],[],null,["Introduction\n\nThis tutorial shows you how to add a Google map with a marker to a web page\nusing custom HTML elements. Here is the map you'll create using this\ntutorial. Two markers are positioned, one in Mountain View, CA, and one in\nSeattle, WA.\n\n\nGet started\n\nThese are the steps we'll cover for creating a Google map with a marker using\nHTML:\n\n1. [Get an API key](#key)\n2. [Create HTML, CSS, and JS](#step-2)\n3. [Add a map](#step-3)\n4. [Add a marker](#step-4)\n\nYou need a web browser. Choose a well-known one like Google Chrome\n(recommended), Firefox, Safari or Edge, based on your platform from the\n[list of supported browsers](/maps/documentation/javascript/browsersupport).\n\nStep 1: Get an API key\n\nThis section explains how to authenticate your app to the\nMaps JavaScript API using your own API key.\n\nFollow these steps to get an API key:\n\n1. Go to the\n [Google Cloud console](https://console.cloud.google.com/project/_/google/maps-apis/overview).\n\n2. Create or select a project.\n\n3. Click **Continue** to enable the API and any related services.\n\n4. On the **Credentials** page, get an **API key** (and set the API key\n restrictions). Note: If you have an existing unrestricted API key, or a key\n with browser restrictions, you may use that key.\n\n5. To prevent quota theft and secure your API key, see\n [Using API Keys](https://cloud.google.com/docs/authentication/api-keys).\n\n6. Enable billing. See [Usage and Billing](/maps/documentation/javascript/usage-and-billing)\n for more information.\n\n7. You are now ready to use your API key.\n\nStep 2: Create HTML, CSS, and JS\n\nHere's the code for a basic HTML web page: \n\n```javascript\n\u003chtml\u003e\n \u003chead\u003e\n \u003ctitle\u003eAdd a Map with Markers using HTML\u003c/title\u003e\n\n \u003c!-- TODO: Add bootstrap script tag. --\u003e\n \u003c/head\u003e\n \u003cbody\u003e\n \u003c!-- TODO: Add a map with markers. --\u003e\n \u003c/body\u003e\n\u003c/html\u003e\n```\n\nIn order to load a map, you must add a `script` tag containing the\nbootstrap loader for the Maps JavaScript API, as shown in the\nfollowing snippet (add your own API key): \n\n```javascript\n\u003cscript\n src=\"https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=maps,marker\"\n defer\n\u003e\u003c/script\u003e\n```\n\nSpoiler alert: [Try the finished example on JSFiddle](https://jsfiddle.net/gh/get/library/pure/googlemaps/js-samples/tree/master/dist/samples/web-components-markers/jsfiddle).\n\nStep 3: Add a map\n\nTo add a Google map to the page, copy the `gmp-map` HTML element and paste it\nwithin the `body` of the HTML page: \n\n```javascript\n\u003cgmp-map center=\"37.4220656,-122.0840897\" zoom=\"10\" map-id=\"DEMO_MAP_ID\" style=\"height: 400px\"\u003e\u003c/gmp-map\u003e\n```\n\nThis results in the following map:\n\n\nThe map you just created is centered on the San Jose metropolitan area.\n\nStep 4: Add a marker\n\nTo add a marker to the map, use the `gmp-advanced-marker` HTML element.\nCopy the following snippet, and paste over the entire `gmp-map` you added in the\nprevious step.\n\n\n```html\n\u003cgmp-map\n center=\"43.4142989,-124.2301242\"\n zoom=\"4\"\n map-id=\"DEMO_MAP_ID\"\n style=\"height: 400px\"\n\u003e\n \u003cgmp-advanced-marker\n position=\"37.4220656,-122.0840897\"\n title=\"Mountain View, CA\"\n \u003e\u003c/gmp-advanced-marker\u003e\n \u003cgmp-advanced-marker\n position=\"47.648994,-122.3503845\"\n title=\"Seattle, WA\"\n \u003e\u003c/gmp-advanced-marker\u003e\n\u003c/gmp-map\u003ehttps://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/web-components-markers/docs/index.html#L17-L31\n```\n\n\u003cbr /\u003e\n\nThe preceding code adds two markers and changes the `zoom` and `center`\nparameters on the `gmp-map` to better show those markers. A map ID is required\nto use Advanced Markers (`DEMO_MAP_ID` is fine to use).\n\nTips and troubleshooting\n\n- You can customize the map with custom [styling](/maps/documentation/javascript/cloud-customization).\n- Use the **Developer Tools Console** in your web browser to test and run your code, read error reports and solve problems with your code.\n- Use the following keyboard shortcuts to open the console in Chrome: \n Command+Option+J (on Mac), or Control+Shift+J (on Windows).\n- Follow the steps below to get the latitude and\n longitude coordinates for a location on Google Maps.\n\n 1. Open Google Maps in a browser.\n 2. Right-click the exact location on the map for which you require coordinates.\n 3. Select **What's here** from the context menu that appears. The map displays a card at the bottom of the screen. Find the latitude and longitude coordinates in the last row of the card.\n- You can convert an address into latitude and longitude coordinates using the\n Geocoding service. The developer guides provide detailed information on\n [getting started with the Geocoding service](/maps/documentation/javascript/geocoding#GetStarted).\n\nFull example code\n\nFollowing is the final map, and full example code that was used for this\ntutorial.\n\n\n```html\n\u003chtml\u003e\n \u003chead\u003e\n \u003ctitle\u003eAdd a Map with Markers using HTML\u003c/title\u003e\n\n \u003clink rel=\"stylesheet\" type=\"text/css\" href=\"./style.css\" /\u003e\n \u003cscript type=\"module\" src=\"./index.js\"\u003e\u003c/script\u003e\n \u003c/head\u003e\n \u003cbody\u003e\n \u003cgmp-map\n center=\"43.4142989,-124.2301242\"\n zoom=\"4\"\n map-id=\"DEMO_MAP_ID\"\n style=\"height: 400px\"\n \u003e\n \u003cgmp-advanced-marker\n position=\"37.4220656,-122.0840897\"\n title=\"Mountain View, CA\"\n \u003e\u003c/gmp-advanced-marker\u003e\n \u003cgmp-advanced-marker\n position=\"47.648994,-122.3503845\"\n title=\"Seattle, WA\"\n \u003e\u003c/gmp-advanced-marker\u003e\n \u003c/gmp-map\u003e\n\n \u003c!-- \n The `defer` attribute causes the script to execute after the full HTML\n document has been parsed. For non-blocking uses, avoiding race conditions,\n and consistent behavior across browsers, consider loading using Promises. See\n https://developers.google.com/maps/documentation/javascript/load-maps-js-api\n for more information.\n --\u003e\n \u003cscript\n src=\"https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&libraries=maps,marker&v=beta\"\n defer\n \u003e\u003c/script\u003e\n \u003c/body\u003e\n\u003c/html\u003ehttps://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/web-components-markers/docs/index.html#L8-L46\n```\n\n\u003cbr /\u003e"]]
