To improve safety of work for unloading a frozen tuna, improve work efficiency, and prevent breakage of the frozen tuna in a wholesale market.

A first chute 9 of an unloading device 2 is constituted in such a way that an inclined face 14 is formed by a slope having small grade to facilitate loading of the frozen tuna. When the frozen tuna slides on the first chute 9 and a second chute 10, sliding of the frozen tuna to a side is prevented by fences 15, 17 provided on the first chute 9 and the second chute 10 to slide it onto a receive base 3 securely. Impact force applied to the frozen tuna which slides onto the receive base 3 is absorbed by a buffer member 20 to prevent the frozen tuna from being damaged. When stopping slide of the frozen tuna temporarily in a storage part, impact force is reduced by a buffer material attached to a stopper 21 to prevent the damage of the frozen tuna.