PURPOSE: To securely fix a carriage to each of the up-down-right-left corners of an insulated container by fitting arms, which have the ends provided with pieces in contact with the inside corners of the insulated container, on two upper-side clamp shafts and cams, which are put in contact with the inside face of the insulated container, on two lower-side clamp shafts.

CONSTITUTION: An insulated container 1 has the corners provided with four clamp shafts 3, 3, 4, 4 extended from the entrance to the back. The rotational movement of the clamp shaft 3 allows an arm 5 and a contact piece 6 to be rotated to the insulated container 1 and engaged with the inside corner, so that up-and-down fixing is secured by the upper face of the contact piece 6 and right-and-left fixing is secured by the side face of the contact piece 6. After fixing, a locking rod 8 is inserted therein on the back side for locking. The lower-side clamp shaft 4 has an elliptical cam 7 moved with rotational movement from a normal condition as shown in chain lines to the condition that the long portion is engaged with the inside face of the insulated container 1, thus to perform right-and-left fixing.