A snare strainer adapted to a snare drum is equipped with two strainers, which are attached to the opposite positions on the circumferential exterior of a cylinder of the snare drum and which control a snappy member to be selectively brought into contact with or separated from the backside head opposite to the drumhead. Herein, a moving base vertically moves along a fixed base attached to the circumferential exterior of the cylinder; holding members, which are tightly joined together so as to hold the terminal of the snappy member, are supported by a support member fixed to the moving base. The holding members are engaged with the support member due to a magnetic attraction exerted by permanent magnets. This makes it possible for the person to detachably attach the holding members to the support member without using tools; hence, it is possible to improve the handling of the snare strainer.