Patent ID: 8337973

Claim:
A structure of a cylindrical boss forming place of a cabinet, the structure comprising: a resin-molded plate having a first face which is flat and a second face which is opposite to the first face; and a resin-molded boss formed into a cylindrical shape and integrally protruded from the second face of the plate, wherein: a thickness t of a cylinder wall at a base end of the boss is less than a reference thickness T of the plate, and when the plate is divided into a circular-shaped first area partly defining an inner space of the cylindrical boss, a ring-shaped second area disposed around the first area so as to correspond to the cylinder wall and a peripheral third area disposed so as to surround the second area, the peripheral third area is formed such that a thickness of the third area at an innermost portion is equal to the thickness t of the cylinder wall, the thickness of the third area increases from the inside to the outside, and the thickness of the third area at an outermost portion is equal to the reference thickness T of the plate, and the circular-shaped first area is formed such that a thickness T 1 of the first area is less than 0.6 times the thickness t of the cylinder wall.