Patent ID: 8412299

Claim:
A biological information measurement device provided with a light emission portion for emitting light to an inserted fingertip and a light reception portion for receiving transmitted light, comprising: a first holding portion; a second holding portion forming a fingertip insertion recess together with said first holding portion, wherein a fingertip is to be inserted into the recess, the second holding portion is opposed to the first holding portion with said fingertip insertion recess lying therebetween, and the second holding portion being capable of relative displacement with respect to the first holding portion in a direction of opening and closing of a fingertip insertion port of said fingertip insertion recess; and a restriction member for restricting relative displacement of said first and second holding portions to avoid any exposed gap between the first holding portion and the second holding portion, except for the fingertip insertion port of said fingertip insertion recess, forming around the fingertip insertion port of said fingertip insertion recess when said fingertip insertion portion is opened.