The internal combustion engine includes an oil storage portion in which a suction portion of oil supplied to various parts of the internal combustion engine body is disposed, an oil channel through which the bubble-containing oil returned from the various parts of the internal combustion engine body to the oil storage portion flows, and a high pressure portion in which the oil is supplied and becomes higher than the atmospheric pressure, and an oil injection hole for injecting oil toward the bubble-containing oil flowing in the oil channel is provided.

Provided is a balancer device for an internal combustion engine, which includes: an upper-side housing to be mounted to an internal combustion engine; a lower-side housing fixed to the upper-side housing; a balancer main body accommodated in a space defined by the upper-side housing and the lower-side housing; and an oil pump fixed at least to the upper-side housing. An end surface portion of the upper-side housing and an end surface portion of the oil pump are mounted in contact with each other, and an end surface portion of the lower-side housing and the end surface portion of the oil pump are mounted to each other so as to define a predetermined gap.

The internal combustion engine includes an oil storage portion in which a suction portion of oil supplied to various parts of the internal combustion engine body is disposed, an oil channel through which the bubble-containing oil returned from the various parts of the internal combustion engine body to the oil storage portion flows, and a high pressure portion in which the oil is supplied and becomes higher than the atmospheric pressure, and an oil injection hole for injecting oil toward the bubble-containing oil flowing in the oil channel is provided.