Provided is a sacrum pressing tool that can provide improvement in transmission function between the upper body and the lower body, thus improving the motor function, through stabilization of the sacrum per se at the time of not only body rest, but also body movement or physical exercise. The sacrum pressing tool (X) includes a solid pillar-like base (21), and a pair of protruding portions (22) protruding in left-right symmetry from opposed side portions of the base (21). A width between outer side faces (22b) of the pair of protruding portions (22) is set smaller than a width between a pair of the superior posterior iliac spines (13), so that pressing faces (22a) of the pair of protruding portions (22) press a sacrum (11) solely.
