Leaf spring device

A leaf spring device comprising a plurality of leaf springs provided to be stacked in a vertical direction, wherein

• a restricting protrusion is provided on a surface of one of two leaf springs adjacent to each other in the vertical direction, a recessed part is formed on a surface of the other thereof, and the restricting protrusion is inserted into the recessed part,
• a longitudinal direction of each of the restricting protrusion and the recessed part coincides with a longitudinal direction of the leaf springs when viewed from the vertical direction,
• central portions of the leaf springs, the restricting protrusion, and the recessed part coincide with each other when viewed from the vertical direction,
• the restricting protrusion includes a first side surface and a second side surface facing a plate width direction perpendicular to the vertical direction and the longitudinal direction, extending in the longitudinal direction, and positioned on both sides sandwiching the central portions of the leaf springs, the restricting protrusion, and the recessed part in the plate width direction when viewed from the vertical direction,
• the recessed part includes a third side surface and a fourth side surface facing the plate width direction, extending in the longitudinal direction, and facing each other with the restricting protrusion sandwiched therebetween in the plate width direction,
• the first side surface and the third side surface face each other in the plate width direction,
• the second side surface and the fourth side surface face each other in the plate width direction,
• in a plan view from the vertical direction, an edge of a first inclined surface is formed on an edge of one side surface of the first side surface and the third side surface to become further away from an edge of the other side surface thereof in the plate width direction from a central axis passing a center of the leaf spring device toward a first direction in the longitudinal direction, and
• in the plan view, an edge of a second inclined surface is formed on an edge of one side surface of the second side surface and the fourth side surface to become further away from the other side surface thereof in the plate width direction from the central axis toward a second direction opposite to the first direction in the longitudinal direction.