A clamping member and a battery accommodating device are provided. The battery accommodating device includes a body and a clamping member pivotally connected to the body. The clamping member has two arm parts, two protruding parts respectively extending from one side of the two arm parts, and an elastic structure connected to the two arm parts at two ends. When the battery is placed in an accommodating slot of the body, the elastic structure is pressed by the battery, and one end of the battery is clamped between the two protruding parts and the elastic structure. When the two protruding parts are pushed by an external force, the clamping member rotates relative to the body, and the elastic structure pushes up the battery, so as to release the clamped end of the battery.