Holder and light measuring device using same

A holder configured to be mounted on the head of a subject, comprising:

• a linear backbone portion extending in a first direction;
• at least two linear branch portions, extending from the linear backbone portion along a second direction from a front of the head toward a back of the head when the holder is adapted to be mounted on the head of the subject, each configured to hold at least one of a light-transmitting probe for emitting light and a light-receiving probe for receiving light, free ends of the at least two linear branch portions being tapered to comb hair of the subject when the holder is adapted to be mounted on the head of the subject to cause the tapered free ends to be adapted to be inserted into the hair of the subject along the second direction;
• and
• a disposition reference point disposed so as to match a first specific point that is preset on the head of said subject.