Cushion for retaining posture of child and structure using same cushion

A cushion adapted to be placed on a child safety seat for a vehicle in order to retain a posture of a child in a seating condition, comprising:

• a head pad having:
• a neck supporting portion for supporting the neck of a child, the portion protruding outwardly along a lower rim of the head pad;
• and
• a pair of head side supporting surfaces for supporting the head of the child from both sides of the head of the child, each of the head side supporting surfaces being inclined upwardly toward a left or a right end of the head pad;
• and
• a back pad having a pair of body side supporting surfaces for supporting the body sides of the child, each of the body side supporting surfaces being inclined upwardly toward a left or a right end of the back pad;
• and
• a hip pad having:
• a hip supporting surface for supporting the hip of the child, the hip supporting surface being inclined upwardly from a rear end of the hip pad toward a front end of the hip pad;
• a pair of knee supporting surfaces for supporting the knees of the child, each of the knee supporting surfaces being inclined upwardly toward a left or a right end of the hip pad;
• a leg supporting surface is formed on the hip pad in a front of the hip supporting surface, and the leg supporting surface is inclined downwardly toward the front end of the hip pad;
• and
• a belt pass-through hole, through which a crotch belt provided on the child safety seat passes, is opened on the leg supporting surface so that a ridge line defining a boundary between the hip supporting surface and the leg supporting surface is positioned rearward from the belt pass-through hole,
• wherein the ridge line is an intersection point between the upward incline of the hip supporting surface and the downward incline of the leg supporting surface, and
• wherein the back pad and the hip pad are separable from each other, so that the back pad can be placed on a back portion of the child safety seat and the hip pad can be placed on a seat portion of the child safety seat.