Buckle

A buckle comprising:

• a female part including a housing and an engaging portion provided at an inner surface of the housing;
• a male part including a base and an inserted portion to be inserted into the housing of the female part, the inserted portion including a base end coupled to the base, a free end opposite to the base end, and an engaged portion to be engaged with the engaging portion, wherein
• the inserted portion, while having a thickness, extends from the base end to the free end, and is elastically pivotable around the base end as a pivot center to allow engagement and disengagement of the engaging and engaged portions, wherein
• when a force is applied to the male part for pulling the male part out of the housing, the engaged portion has a contact surface that is in planar contact with the engaging portion, wherein
• provided that downward indicates a direction along movement of the inserted portion from its initial posture toward its deformed posture during the engagement and disengagement of the engaging and engaged portions and upward indicates a direction along movement of the inserted portion recovering from the deformed posture toward the initial posture,
• (i) relative to a first center point at the center of the base end in a thickness direction of the inserted portion, a second center point at the center of the contact surface in said thickness direction is positioned downward;
• or
• (ii) relative to an uppermost position at a lower surface of the base end, a position at a lower end of the contact surface is positioned downward.