To lock and unlock all doors by one operation and to improve an operating property by interlocking and connecting a plural number of lock mechanisms to lock each of the doors and a single lock handle through an interlocking mechanism on a van furnished with a plural number of the doors in a cargo compartment.

Eight pieces of front and rear doors arranged left and right of a cargo compartment are locked and unlocked by transmitting push-pull operation of a lock handle 20 to four engagement hooks arranged left, right, in the front and the rear of a lower part of the cargo compartment through an interlocking mechanism C. Additionally, the interlocking mechanism C is made in linkage constituted of a plural number of levers 41-44, 46, 47 and connecting rods 45, 51 and stored in an inside space S of a front wall. Consequently, it is possible not to reduce the capacity of the cargo compartment and to smoothly maintain lubrication and working of each of friction parts. Additionally, it is possible to eliminate a hindrance for travelling and working due to projection of the lock handle 20 outside by arranging the lock handle 20 in a recessed part 31 formed on a right side surface of the cargo compartment and to prevent breakage and burglary.