To remarkably improve operability by facilitating the detaching/ attaching operation of a spring without a large load to a hand or fingers.

This detaching/attaching tool is constituted of a plate or bar like win body 2 having an optional length, a mountain-formed thick part 3 formed in one body at the upper part of the front side of the main body 2, a groove 4 formed in the direction of a short side on the lower face in the neighborhood of the tip 2a of a main body 2, a tilted face 5 formed backward from a tip on the upper face on the front side of the part 3, and a restraining face 6 standing in the direction of the short edge at the upper part of the part 3. The tool can be constituted of a plate like main body 2 having an optional length a mountain line bend 3a obtained by bending the front side of the main body 2 upward, a tilting face 5a formed on the front side of the bent 3a, an a hooking part 2b in the form of a hook obtained by bending the tip part of the main body 2 downward.