An image forming apparatus enabling suppression of charging non-uniformity due to vibration of a corona charger without impairing motion of a grid cleaning member in a constitution in which the corona charger is supported by supporting members adjacent to respective sides of the corona charger with respect to a circumferential direction of a photosensitive member is provided.An image forming apparatus 100 includes a corona charger 12, first and second supporting members for supporting the corona charger 12 on the respective sides of the corona charger with respect to the circumferential direction of the photosensitive member, and first and second urging portions 18a, 18b for urging a shield 123 of the corona charger 12 in the first and second supporting members, and the first urging portion 18a and the second urging portion 18b urge the shield 123 at no-opposing positions to each other with respect to a longitudinal direction of the corona charger.