PURPOSE: To prevent a lens from being cracked by storing an object to be washed in a storage case together with washing liquid, inserting the storage case into a washing vessel and applying oscillation to wash the object by supplying the output of an oscillation circuit to an oscillator.

CONSTITUTION: In the body case 1, an oscillator 3 which is oscillated by the high frequency voltage generated in an oscillation circuit member 2 is held by an oscillator supporting base part 1C projected from the inside of the bottom part 1A of the body 1 via a vibration-proof member 4 which is engaged in the annularly recessed part 1D formed on the upper part of the part 1C. In the case that a contact lens 6 is put in the washing vessel 5, the lens 6 is held in a transparent cylindrical storage case 8 by being seized with the arcuate chucks 9 provided on the lower plane of each cap 10 of the case 8. The washing liquid is charged in the storage case 8 with the contact lens 6 held by the chuck part 9, and the whole of the storage case 8 is put in the washing vessel 5 filled up with water, so that the contact lens 8 is held is the washing liquid without being directly brought into contact with the washing vessel 5.