To provide an instantaneous cooling pack configured to generate cooling action by reacting a coolant with water, which is represented by a cooling pillow to be cooled in a freezer etc. and wrapped by a towel etc. to moderate its significant negative cooling temperature in use, and allow a plurality of cooling temperatures for one cooling pack.

A heat insulating member is arranged on a face of a storage back storing the coolant, so as to obtain a plurality of cooling temperatures. The heat insulating member moderates also temperature rise of cooling fluid in the pack, thereby increasing cooling time.