Patent ID: 8806989

Claim:
A monkey wrench, comprising: a wrench body including a fixed jaw; a movable jaw configured to advance and retreat on the wrench body to sandwich an object to be sandwiched between the movable jaw and the fixed jaw; and a space adjusting mechanism where a rack formed at the movable jaw engages a worm turnably disposed at the wrench body, wherein the wrench body includes a plurality of fitting depressed portions depressed on a side surface of the wrench body along an advancing/retreating direction of the movable jaw and a plurality of rows parallel to one another, the rows being formed of the plurality of fitting depressed portions at spaces from one another in a direction perpendicular to the advancing/retreating direction of the movable jaw, and the movable jaw includes: a leaf spring portion having: a base end side on the side surface of the movable jaw; and a distal end side facing the side surface of the wrench body, the leaf spring portion being formed as a leaf spring that is elastically deformable in a contact and separation direction with respect to the side surface of the wrench body; a protrusion positioned at the distal end side of the leaf spring portion, the protrusion protruding toward the side surface of the wrench body, the protrusion being formed to fit the fitting depressed portion; and a positioning unit configured to position the leaf spring portion in each position that allows fitting of the protrusion into the fitting depressed portion in each row among the plurality of the rows.