An engine including an oil level regulating apparatus , the oil level regulating apparatus comprising: a valve unit (A) including a cylindrical housing having an inflow hole opened at a first axial end, an outflow hole opened in a side wall, and a leak hole disposed at a second axial end of the outflow hole, a partition separating the outflow hole and the leak hole in the housing , defining a valve chamber (R) close to the outflow hole, and having a partition continuous hole axially penetrating the partition , a valve disposed in the valve chamber (R), configured to reciprocate axially, dividing the valve chamber (R) into an introduction chamber (Ra) close to the inflow hole and a pressure chamber (Rb) close to the partition , and having a valve continuous hole axially penetrating the valve , and a valve biasing member disposed in the valve chamber (R) and biasing the valve toward the first axial end; and a solenoid unit (B) including a solenoid having a reciprocable shaft ; wherein a leak channel (L2) is defined as an oil channel including the inflow hole , the introduction chamber (Ra), the valve continuous hole , the pressure chamber (Rb), the partition continuous hole , and the leak hole , the shaft is configured to open and close the leak channel (L2) on a downstream side of the pressure chamber (Rb), and the valve is switched to a closed valve state of closing the outflow hole when the shaft closes the leak channel (L2), characterized in that the valve of the oil level regulating apparatus has a closed valve switch hole in communication with the introduction chamber (Ra), and the closed valve switch hole communicates with the outflow hole in the closed valve state. a valve unit (A) including a cylindrical housing having an inflow hole opened at a first axial end, an outflow hole opened in a side wall, and a leak hole disposed at a second axial end of the outflow hole, a partition separating the outflow hole and the leak hole in the housing , defining a valve chamber (R) close to the outflow hole, and having a partition continuous hole axially penetrating the partition , a valve disposed in the valve chamber (R), configured to reciprocate axially, dividing the valve chamber (R) into an introduction chamber (Ra) close to the inflow hole and a pressure chamber (Rb) close to the partition , and having a valve continuous hole axially penetrating the valve , and a valve biasing member disposed in the valve chamber (R) and biasing the valve toward the first axial end; and a solenoid unit (B) including a solenoid having a reciprocable shaft ; wherein a leak channel (L2) is defined as an oil channel including the inflow hole , the introduction chamber (Ra), the valve continuous hole , the pressure chamber (Rb), the partition continuous hole , and the leak hole , the shaft is configured to open and close the leak channel (L2) on a downstream side of the pressure chamber (Rb), and the valve is switched to a closed valve state of closing the outflow hole when the shaft closes the leak channel (L2), characterized in that the valve of the oil level regulating apparatus has a closed valve switch hole in communication with the introduction chamber (Ra), and the closed valve switch hole communicates with the outflow hole in the closed valve state. <EOS>