To provide a submerged pump oil monitoring device capable of detecting immersion into an oil chamber and leakage of oil stably with high reliability, operating this monitoring device continuously without causing trouble of a shaft-sealing device due to reduction of oil, and replenishing oil without pulling up a pump from the water.

This submerged pump oil monitoring device A for monitoring immersion into the oil chamber 13 incorporating the shaft-sealing device 12 attached to a rotary shaft 11 of a motor of the submerged pump 10 and leakage of oil 17 is provided with an oil tank 15 installed on the ground 14, a communicating pipe 16 for communicating and connecting the oil tank 15 and the oil chamber 13 mutually, and a liquid level detection sensor 18 attached to the oil tank 15 to detect fluctuation of liquid level of oil 17 in the oil tank 15.