An image forming apparatus comprising: a latent image bearing body that bears a latent image; a charging member applied with a charging voltage and configured to charge a surface of said latent image bearing body; a developer bearing body applied with a developing voltage and configured to develop said latent image by causing a developer to adhere to said latent image, a developer regulating member applied with a regulating-member-application voltage and configured to form a layer of said developer on said developer bearing body, and a voltage switching unit (41, 51) configured to switch said regulating member-application voltage (Vbl-0, Vbl-2) and at least one of said charging voltage (Vdr-0, Vdr-2) and said developing voltage (Vdv-0, Vdv-2); wherein said voltage switching unit (41, 51) is configured to switch said regulating-member-application voltage between an image forming period and a predetermined voltage-changing period provided in a non-image forming period, wherein, in said voltage-changing period, an absolute value of said regulating-member-application voltage (Vbl-2) is larger than an absolute value of said developing voltage (Vdv-2), and an absolute difference between said regulating-member-application voltage (Vbl-2) and said developing voltage (Vdv-2) is larger than in said image forming period, wherein, in said voltage-changing period, an absolute value of a surface voltage (Vdr-2) of said latent image bearing body is larger than an absolute value of said developing voltage (Vdv-2), and said surface voltage (Vdr-2) of said latent image bearing body is of the same polarity as said developing voltage (Vdv-2), and characterised in that, in said voltage-changing period, an absolute difference between said surface voltage (Vdr-2) of said latent image bearing body and said developing voltage (Vdv-2) is smaller than in said image forming period. a charging member applied with a charging voltage and configured to charge a surface of said latent image bearing body; a developer bearing body applied with a developing voltage and configured to develop said latent image by causing a developer to adhere to said latent image, a developer regulating member applied with a regulating-member-application voltage and configured to form a layer of said developer on said developer bearing body, and a voltage switching unit (41, 51) configured to switch said regulating member-application voltage (Vbl-0, Vbl-2) and at least one of said charging voltage (Vdr-0, Vdr-2) and said developing voltage (Vdv-0, Vdv-2); wherein said voltage switching unit (41, 51) is configured to switch said regulating-member-application voltage between an image forming period and a predetermined voltage-changing period provided in a non-image forming period, wherein, in said voltage-changing period, an absolute value of said regulating-member-application voltage (Vbl-2) is larger than an absolute value of said developing voltage (Vdv-2), and an absolute difference between said regulating-member-application voltage (Vbl-2) and said developing voltage (Vdv-2) is larger than in said image forming period, wherein, in said voltage-changing period, an absolute value of a surface voltage (Vdr-2) of said latent image bearing body is larger than an absolute value of said developing voltage (Vdv-2), and said surface voltage (Vdr-2) of said latent image bearing body is of the same polarity as said developing voltage (Vdv-2), and characterised in that, in said voltage-changing period, an absolute difference between said surface voltage (Vdr-2) of said latent image bearing body and said developing voltage (Vdv-2) is smaller than in said image forming period.