Living hinge formed by compressed material

A structure body having a resin body, the resin body comprising:

• a first main body portion, a second main body portion, and a hinge portion
• wherein
• the first main body portion and the second main body portion are connected at the hinge portion with each other so as to be rotatable with respect to each other, the first main body portion and the second main body portion comprising a front wall and a back wall facing each other with a gap, and a surrounding wall connecting surroundings of the front wall and the back wall, wherein
• the hinge portion comprises a first thin portion, a second thin portion, and a thick portion, wherein the thick portion is a portion being larger in wall thickness than the first thin portion and the second thin portion;
• the first thin portion, the second thin portion, and the thick portion elongate in a longitudinal direction of the hinge portion;
• the thick portion is sandwiched by the first thin portion and the second thin portion in a width direction of the hinge portion;
• and
• a wall thicknesses of the first thin portion, the second thin portion, and the thick portion are each smaller than a sum of wall thickness of the front wall and the back wall.