Balancer structure for internal combustion engine, and internal combustion engine

A balancer structure for an internal combustion engine, the balancer structure comprising:

• a first balance shaft that extends in a direction along a crankshaft of the internal combustion engine;
• a second balance shaft that extends in the direction along the crankshaft;
• a first balancer weight arranged to be rotatable integrally with the first balance shaft;
• a second balancer weight arranged to be rotatable integrally with the second balance shaft;
• a transmission driving gear arranged to be rotatable integrally with the crankshaft;
• a transmission driven gear arranged to be rotatable integrally with the first balance shaft, the transmission driven gear meshing with the transmission driving gear;
• a balancer driving gear arranged to be rotatable integrally with the first balance shaft;
• a balancer driven gear arranged to be rotatable integrally with the second balance shaft, the balancer driven gear meshing with the balancer driving gear;
• and
• an output portion arranged on the first balance shaft, the output portion outputting torque to an engine-driven accessory.