A tension fluctuation alleviating device, for use in a fabric printing apparatus including a fabric supplying device, a printing mechanism, a guide between the fabric supplying device and the printing mechanism, and a fabric take-up device, the fabric printing apparatus configured to perform printing on the fabric while intermittently sending the fabric to the printing mechanism, includes a support member provided between the fabric supplying device and the guide device and extending across a width direction of the fabric, and a tension relieving member including an elastically deformable elastic portion supported by the support member and extending from the support member toward the fabric, and a contacting portion closer to the fabric than the elastic portion and contacting with the fabric.