To provide an inexpensive brain wave measuring support tool for eyeballs capable of removing the eyeball artifact, easily performing photoactivation, and accurately measuring the brain wave.

The brain wave measuring support tool for eyeballs comprises a body part 1 with eyeball presser parts 3 for restricting the movement of the eyeballs and a belt part 2 for putting the body part 1 pressed on a user's face and holding the body part around the user's head. Each eyeball presser part 3 has a swelling pedestal with a working surface with a prescribed area projecting from the body part 1 toward the eyeball for pressing the surface of the eyelid evenly.