To provide a grip for a rotary tool in which a grip member and a hand putting member can be easily gripped and by which a rotary tool can be strongly and easily rotated even by one-hand work and stable gripping easiness can be constantly secured.

The hand putting member 4, which is brought into contact with a palm, is rotatably provided to the rear part of the grip member 3 to which the rotary tool 2 is mounted. A bulging part 11, which expands a contact area by bulging radially outward, is formed to a part of the outer peripheral part of the hand putting member 4.