Leaf spring device

A leaf spring device comprising:

• a leaf spring main body;
• a first eye portion provided at a first end portion of the leaf spring main body in a longitudinal direction;
• a second eye portion provided at a second end portion of the leaf spring main body in the longitudinal direction;
• and
• a connection piece connecting the second eye portion and a vehicle body to each other, the connection piece being formed to be elastically deformable in the longitudinal direction,
• wherein the first eye portion is connected to the vehicle body to be rotatable around a first axis extending in a width direction of the leaf spring main body,
• the second eye portion is connected to the connection piece to be rotatable around a second axis extending in the width direction,
• a central region of the leaf spring main body in the longitudinal direction supports an axle,
• the leaf spring main body is provided to be flexibly deformable upward, and
• a connection portion of the leaf spring main body, at which the leaf spring main body is connected to the second eye portion, is urged by an elastic restoring force of the connection piece in a direction in which the connection portion is displaced along the longitudinal direction at an initial stage of a process in which the leaf spring main body is flexibly deformed upward.