Structure of a coffin

An improved structure of a coffin comprising a base seat board, a left side board and a right side board, a rear side board and a front side board, and a top cover board, the base seat board having a left, right, front, and rear side, a top, and a bottom wherein the left and right sides of the base seat board are provided with inverted T-shaped sliding slots and the top of the base seat board is provided with recesses adjacent the front and rear side thereof, a bottom of the left and right side boards is provided with an inverted T-shaped sliding rail and a top of the left and right side boards is provided with T-shaped sliding slots, left and right ends of the front and rear side boards are provided with T-shaped sliding rails, two cavities are provided on a back surface of the top cover board to hold the rear and front side boards during transporting, a bottom of the front and rear side boards is provided with a protruded board, and the top cover board is provided with slots adapted to engage with upper edges of the left and right side boards.