To provide a holder of an object to be polished capable of suppressing a deficiency such as production of a crack while enhancing processing efficiency.

This holder is equipped with a template 3 in which a recessed hole 2 for an object 1 to be polished to be engaged with is opened and a packing material 4 to hold the object 1 to be polished and has a water filling hole 5 at the corner part of the recessed hole 2 of the template 3. It also has an area 7 notched outward in the vicinity of the water filling hole 5 on a side 6 sandwiching the water filling hole 5 at the corner part of the recessed hole 2.