An oil level gauge is provided to conveniently check an engine oil by allowing for ease of separation and re-assembly of the oil level gauge. An oil level gauge(100) includes a handle(110) having a front end with a sealing portion(130) for preventing leakage of oil through the gap formed between a guide tube and the oil level gauge. The sealing portion has a sealing shaft which has an outer surface with a screw portion and is connected to the front end of the handle; a hollow sealing member where the sealing shaft is inserted; a flange connected to the sealing shaft so that one end of the sealing member is supported; and a nut coupled to the screw portion of the sealing shaft so that load is applied in an axial direction to the other end of the sealing member.
