To provide a screw rod wrench that can remarkably improve work efficiency.

A screw rod wrench making a screw rod 3 rotatable by mounting a nut body 1 into a wrench part of a rotating tool 2 and laterally pushing to rotate the tool 2, a cylindrical socket body 4 with a through hole that can fit the screw rod 3 is provided with a screw rod wrench part 4A with ratchet rotating mechanism chucking the screw rod 3, fitted into the through hole 4', in a clamp-rotating direction but not chucking it in an opposite rotating direction, and a mounting part 4B that can be fittingly mounted in a whirl-stop state into the wrench part of the tool 2.