# Tatsuya Tsuruoka

> Tatsuya Tsuruoka is a angel investor at Mercari (Tokyo) backing Wearables and Biometrics. See 1 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Mercari](https://shizune.co/investors/profile/mercari)
- Location: Tokyo, Japan
- Total investments: 1
- Last investment: Jun 2020
- Lead investor: 0%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/ttsuruoka/
- Website: https://x.com/ttsuruoka

Tatsuya Tsuruoka is a angel investor at Mercari in Tokyo focused on Wearables and Biometrics. Tatsuya Tsuruoka - Principal Software Engineer @ Mercari

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Wearables | 1 | 100% |
| Biometrics | 1 | 100% |
| Health Care | 1 | 100% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Enstem | Enstem is engaged in the biometric data business and the web marketing business. It also analyzes the body data and subjective data acquired from a dedicated smartwatch and quantifies the condition, enabling the team by analyzing the biometric data obtained from the dedicated smartwatch and the subjective data obtained by the app together. | $233.6K | Angel | Jun 24, 2020 |  |

1 of 1 investments shown.

## About Mercari

VC Fund · Tokyo, Japan

Mercari aims to provide a solution by enabling people to easily sell and purchase second-hand items in a mobile marketplace with their smartphones. Japan’s mobile shopping obsession is finally in the US. Mercari, the resale shopping app, is the country’s biggest community-powered shopping fair in the palm of your hands. The intuitive app lets youbuy and sell anything, from anywhere, in seconds from your phone: fashion, electronics, jewelry, console games, new, pre-owned and hand-made items, Mercari delivers. Listing your item is as simple as uploading a photo and adding a few details, with built-in features that help you easily print out shipping labels and quickly drop packages in the mail. Mercari’s sharing community grows larger and makes the world more sustainable every day.

5 contacts available at Mercari.

| Name | Title | Profile |
| --- | --- | --- |
| John Lagerling | Director and CBO | https://shizune.co/investors/profile/john-lagerling |
| Shintaro Yamada | Director / Founder | https://shizune.co/investors/profile/shintaro-yamada |
| Tatsuya Tsuruoka | Principal Software Engineer | https://shizune.co/investors/profile/tatsuya-tsuruoka |
| Tomokaz Saito | Corporate Legal Manager | https://shizune.co/investors/profile/tomokaz-saito |
| Daisaku Harada | Executive Officer of Souzoh Inc. | https://shizune.co/investors/profile/daisaku-harada |

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## FAQ

### What does Tatsuya Tsuruoka invest in?

Tatsuya Tsuruoka invests primarily in Wearables, Biometrics and Health Care startups, most often at Angel stage. Most of the 1 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### When did Tatsuya Tsuruoka last invest?

The most recent investment recorded for Tatsuya Tsuruoka closed in Jun 2020. Shizune tracks 1 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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