To provide a vest allowing the carry of a knapsack without causing the hindrance in the use of the breast pocket by the shoulder strap of the knapsack.

This vest is composed of a front body part 1 and a back body part 2 integrated with each other using or without using a yoke. The front body part 1 is fixed to the back body part 2 or the yoke at the inside part 11. The outside part 12 of the front body part is detachably connected to the back body part 2 or the yoke. A knapsack can be carried in a manner passing the shoulder strap of the knapsack through the upper part of the back body part 2 and the lower part of the front body part 1 since the front body part 1 is fixed to the yoke or the back body part at the center side (inner side) of the body of the wearing person by sewing, etc., or the yoke is fixed to the back body part 2 at the inner side by sewing, etc., and the outer side of the other member is detachably connected to the body part. Accordingly, the shoulder strap does not pass on the breast pocket of the front body part to allow the effective use of the breast pocket.