PURPOSE: To enable the opening and closing of only a daily hatch cover intersected orthogonally with an inter-panel hinge pin and is stretched toward the end at the reverse side by forming the daily hatch cover at a part of each panel of a folding hatch cover that can freely be folded and make cargo possible by using the daily hatch cover in a refrigerator cargo hold without fully opening the hatch cover.

CONSTITUTION: Hatch covers 11 and 12 that can freely be folded centering around a shaft 13 are stretched and folded by freely swinging the hatch covers centering around a pivot 14. Daily hatch cover panels 2a and 2b are provided at the inner part of the hatch cover panels 11 and 12 that can freely be folded and the center of rotation 3 is aligned with the center of rotation 13 of the hatch covers 11 and 12 and then is aligned with the swing center 14 of the hatch cover panels 11 and 12 through arm members 4a and 4b. As a result, the loss of cooling air is reduced and cargo is possible by using the daily hatch cover in the hatch cover of a refrigerator cargo hold and opening and closing only the daily hatch covers 2a and 2b without fully opening the hatch cover.