A biological optical measurement apparatus 2 to which a measurement probe 3 configured to be inserted into a subject is connected and which performs an optical measurement on body tissue, includes a connector unit 22 to which the measurement probe 3 is detachably connected, a supply unit 24 configured to supply air to the connector unit 22, a pipe 24a that connects the connector unit 22 and the supply unit 24, a pressure detection unit 25 configured to detect a pressure value in the pipe 24a, and an abrasion determination unit 29b configured to determine abrasion of the connector unit 22 based on the pressure value detected by the pressure detection unit 25 under conditions that the measurement probe 3 is connected to the connector unit 22.
