An endpin holder includes a receiving member that has a butting stage against which a tip portion of an endpin with by a cello is butted, and a supporting member that supports the receiving member. The receiving member is rotatably supported by the supporting member. The receiving member is rotatably supported by the supporting member through a bearing. When the cello including the endpin is played, the sound and the acoustic quality can be caused to approach those of the natural resonance of the stringed instrument.