PURPOSE: To provide the structure of a trailer which receives empty pallets on the place except the loading platform of a trailer for transporting and taking charge of them so as to smoothen application control, and is provided with bar member construction to protect the trailer in addition.

CONSTITUTION: In a trailer which wheels 10 are mounted on the rear lower part of the loading platform 10, an auxiliary leg 14 to support the loading platform at stoppage is provided on the front part thereof, and is attracted to run by means of a tractor, a handling method of empty pallets by the trailer by which the empty pallets 21 are received between the auxiliary leg and the wheels so as to transport or take charge of them is provided, and a bar member assembly to receive empty pallets between the bar members and also used as side bumpers by putting the bar members 20C, D, E in a row and fixing lattice-likely in the front and rear, right and left, and up and down directions between the auxiliary leg and the wheels is provided.