2018 Keio Challenger – Men's doubles

Marin and Tomislav Draganja were the defending champions but chose not to defend their title.

Tobias Kamke and Tim Pütz won the title after defeating Sanchai and Sonchat Ratiwatana 3–6, 7–5, [12–10] in the final.

Seeds
• # 🇹🇭 Sanchai Ratiwatana / 🇹🇭 Sonchat Ratiwatana (final)

• # 🇮🇳 Sriram Balaji / 🇯🇵 Yasutaka Uchiyama (first round)

• # Peng Hsien-yin / 🇸🇪 Andreas Siljeström (quarterfinals)

• # 🇯🇵 Toshihide Matsui / Yi Chu-huan (quarterfinals)