旅行ガイド · 2026年6月更新
日本向け最適eSIM (2026)
This guide targets the best eSIM for 日本 decision: coverage for Tokyo, Osaka & Rail Trips, data sizing, and travel eSIM vs local SIM or roaming.
旅行スタイル別データ
| 旅行スタイル別データ | GB | Note |
|---|---|---|
| City week | 3–5 GB | Maps, ride apps, messaging |
| One week + routes | 5–10 GB | Tokyo, Osaka & Rail Trips transfers |
| Hotspot / remote work | 10–20+ GB | Video calls burn data fast |
関連ガイド
日本向けプリペイドeSIMを選ぶ
日本 eSIMプランよくある質問
Match gigabytes and days to your itinerary. Buy from a provider that lists 日本 coverage clearly and install the QR on Wi-Fi before NRT when possible.
Light use (maps, chat): 3–5 GB per week. Heavy streaming or hotspot: 10 GB+ or unlimited tiers if offered.
Yes. Purchase online, scan the QR on Wi-Fi before your international flight, and enable data after landing at NRT.
For 日本 only, choose a 日本 eSIM. If your trip also includes neighbouring countries, compare the regional country list before buying.