To provide a workpiece clamping tool capable of saving a space.

A workpiece set on a workpiece receive face provided in a basic part is clamped by a workpiece clamping face in a tip part of a clamper arm 20 supported on a basic part side turnably. A blade to be moved 23 is formed in a rear part of the clamper arm 20 on which a rotary shaft 21 at an intermediate position is turnably supported. A reciprocating turn path for the blade to be moved is formed, and a drive chamber 32 storing a pair of air bags 40 which located on both sides of the blade to be moved 23 is provided in the basic part. Compressed air is supplied and exhausted through air vents 44 of the air bags 40 to reciprocate and turn the blade to be moved 23 due to their expansion and shrinkage.