A rammer includes: an engine; a reciprocating mechanism (3) including a crank shaft (13) and a connecting rod (14), and configure to convert a rotational force of the engine into a reciprocatory force; a leg part disposed in a forward inclined position in a traveling direction and configure to be moved up and down by the connecting rod (14); and a compacting plate disposed on a bottom end of the leg part. The crank shaft (13) is disposed orthogonally to the traveling direction. The reciprocating mechanism (3) includes a belt reduction mechanism (16) and a gear reduction mechanism (17).