Provided is a cold storage body in which deformation caused by the freezing of a cold storage agent can be reduced. Disclosed is a cold storage body (30) in which a liquid cold storage agent (31) is sealed inside a flat-shaped cold storage container (32) and that stores cold by freezing the cold storage agent (31), wherein the cold storage container (32) includes a first fixed part (35) and second fixed parts (36) at which both surfaces opposing one another in the thickness direction are fixed. The first fixed part (35) is arranged in a central section in the Z direction forming the length direction of the cold storage container (32) and in the X direction forming the width direction, and is formed so as to be longer in the X direction than in the Z direction. At least one said second fixed part (36) is arranged between the first fixed part (35) and each end surface (32c, 32d) of the cold storage container (32) in the Z direction.
