PURPOSE: To guarantee operation from a disturbance magnetic field or the like, by providing a magnetic bubble memory element to which no regular disturbance is applied ordinally with a means to apply the disturbance selectively to a rotary magnetic field in testing of the operation of the magnetic bubble memory element.

CONSTITUTION: A control part 1 controls a driving circuit 2 in accordance with a built in program to drive the magnetic bubble memory element 6 and execute the test of reading/writing operation. The control part 1 controls the on/off of oscillators 3x, 3y to oscillate asynchronous optional frequency with the frequency of rotary magnetic field HR driving current sent from a driving circuit 2 and superpose noise current of which amplitude is optionally set up by amplifiers 4x, 4y to driving current applied to coils 6x, 6y from the driving circuit 2 through modulation transformers 5x, 5y. If the control part 1 controls the on/off of optional one/both of oscillators 3x, 3y as required, driving current based on superposing or non-superposing is supplied selectively with optional period to coils 6x, 6y.