To solve such problems that in a conventional agricultural working machine with a wheel having an elastic sponge member engaged with the outer periphery of a cylindrical wheel body, a slip occurs due to insufficient attachment strength of the sponge member when the sponge member is attached to the wheel body; the removal of an old adhesive member takes labor and effort when the attachment is carried out with adhesion; and a large force is required when rubber having the sponge member disposed along the outer periphery thereof is attached to the wheel body.

A linear fastener 19 tensionally connects between bonding end portions 16a and 16a of the sponge member 16 directly engaged with the outer periphery of a rear wheel body 23.