VPNには価値がありますか?正直な内訳
2026 年 6 月 24 日 · 3 分で読みました · コメント
VPN 広告は、YouTube、ポッドキャスト、あらゆるテクノロジー サイトなど、あらゆる場所にあります。そのほとんどは、VPN の実際の機能を過剰に宣伝しています。ここでは、VPN が本当に役立つ場合とそうでない場合を正直に見ていきます。
VPN が実際に行うこと
- A VPN (Virtual Private Network) routes your internet traffic through a server run by the VPN company, then out to the internet. This has two effects:
- Websites you visit see the VPN server's IP address, not yours. So your location and identity are hidden from those sites.
- Your internet provider (ISP) can see you're connected to a VPN, but cannot see which sites you're visiting.
💻
You
→
🔒
VPN Server
Encrypted tunnel
→
🌐
Website
Sees VPN's IP
ISP は、VPN への暗号化されたトラフィックを認識します。それ以上は何もありません。
VPN が本当に役立つ場合
- Public Wi-Fi. Coffee shops, airports, and hotels run open networks where other users can sometimes intercept unencrypted traffic. A VPN prevents this. This is the single most compelling everyday use case.
- Stopping your ISP from selling your browsing data. ISPs in many countries are legally allowed to log and sell your browsing history. A VPN stops this, though you're now trusting the VPN company instead.
- Accessing geo-restricted content. Netflix libraries, BBC iPlayer, sports streams. A VPN lets you appear to be in a different country.
VPN が役に立たない場合
- Hiding from Google or Facebook. You're logged into these services. They know exactly who you are regardless of your IP address. A VPN does nothing here.
- Complete anonymity. You can still be tracked via browser fingerprinting, cookies, and account logins. A VPN masks your IP — that's all.
- Security on its own. A VPN doesn't protect you from phishing, malware, or weak passwords. It's not a replacement for good security habits.
WORTH IT?
Public Wi-Fi user
Yes ✓
ISP追跡の回避
Yes ✓
地理的に制限されたコンテンツのストリーミング
Sometimes
Google/Facebookから隠す
No ✗
どの VPN を使用するか
- Mullvad — the most privacy-focused option. Accepts cash payment, requires no email to sign up, has a strict no-logs policy that has been independently audited. €5/month.
- ProtonVPN — based in Switzerland (strong privacy laws), open-source, audited, has a free tier. Excellent choice for most people.
- Avoid free VPNs unless they're from a trusted provider like Proton. Free VPN companies often make money by logging and selling your data — the exact opposite of why you'd use a VPN.
公衆 Wi-Fi を定期的に使用する場合、VPN は月額 5 ～ 10 ドルの価値があります。信頼できるネットワークを使用して主に自宅からブラウジングする場合、メリットは小さくなります。しかし、多くの人にとって、ISP 追跡保護だけでも十分な理由になります。
