PROBLEM TO BE SOLVED: To suppress the measurement accuracy deterioration of a sensor due to the sweat of a user.SOLUTION: A biological information acquisition device comprises: a body part having a sensor on a first face and a band part holding said body part and mounting said body part while a second face different from said first face is facing the body of a user. Said body part includes a recess part formed in said first face, and a groove part connected to said recess part and extending to said second face.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】ユーザの発汗によるセンサの測定精度低下を抑制すること。【解決手段】生体情報取得装置は、第1の面にセンサを備える本体部と、前記本体部を保持し、前記第1の面とは異なる第2の面をユーザの身体に向けて前記本体部を装着させるバンド部とを有し、前記本体部は、前記第1の面に形成された凹部と、前記凹部に接続し、前記第2の面まで延びる溝部とを有する。【選択図】図3