Internal combustion engine unit

An internal combustion engine unit, comprising:

• an internal combustion engine body;
• a balancer device attached to a lower portion of the internal combustion engine body;
• and
• an oil pan attached to the lower portion of the internal combustion engine body so as to surround the balancer device, wherein
• an oil outflow hole is formed in the internal combustion engine body so as to return a lubricating oil in the internal combustion engine body to the oil pan, wherein
• the balancer device includes a lower housing and an upper housing jointed with an upper side of the lower housing,
• the lower housing includes a swelling portion formed integrally with the lower housing and swelled so as to cross an outflow direction of the lubricating oil flowing out from an outlet of the oil outflow hole,
• the upper housing includes a guide formed integrally with the upper housing to guide the lubricating oil flowing out from the outlet of the oil outflow hole toward the swelling portion,
• the swelling portion is disposed facing the outlet of the oil outflow hole, is formed so as to swell outward at a side end portion of the lower housing, and includes an oil passage formed so as to supply the lubricating oil stored in the oil pan to the internal combustion engine body,
• the guide is formed at a side end portion of the upper housing so as to be disposed facing the outlet of the oil outflow hole, and includes a through hole configured to communicate with the oil outflow hole, and
• the through hole is disposed so that an entire area of an outlet of the through hole is covered with the swelling portion through a predetermined clearance.