A balancer device for engines, in which first and second balancer shafts are
arranged
in parallel to a crankshaft and the crankshaft rotatingly drives first and second
balancer weights at the same speed as that of the crankshaft, characterized in
that the first balancer weight is arranged on one end of the first balancer shaft
in a direction along the crankshaft, the second balancer weight is arranged on
the other end of the second balancer shaft in the direction along the crankshaft,
and the first and second balancer shafts are made close to the crankshaft so that
loci of rotation of the first and second balancer weights partially overlap a locus
of rotation of that portion of the crankshaft, which is coupled to a conrod when
viewed in the direction along the crankshaft.
