A sheet having a fan-mounting part for mounting a fan is provided. The fan includes a fan body including a cylinder part and a protrusion which is disposed on the cylinder part protruding in a direction substantially perpendicular to a side face of the cylinder part and an engaging member which is fitted on an outer side of the cylinder part and is thus attached to the fan body so as to be opposite the protrusion. The sheet having the fan-mounting part includes a sheet member and a non-stretchable flat ring-shaped reinforcing section. The sheet member has an open hole for receiving the cylinder part of the fan. The reinforcing section has an opening with substantially the same shape as an outer edge of the cylinder part of the fan.