An image forming apparatus, comprising: an image bearing member; a developer bearing member (204, 302) configured to perform a development operation in which an electrostatic image formed on the image bearing member is developed with a developer; driving means (403, 404) configured to rotationally drive the image bearing member and the developer bearing member respectively so that the peripheral velocities of each is variable individually; latent image forming means configured to form an electrostatic image on the image bearing member by forming a light-part potential from a dark-part potential on the image bearing member; and applying means (401, 402) configured to apply a developing bias to the developer bearing member, wherein when a peripheral velocity ratio is defined as a ratio of the peripheral velocity of the developer bearing member to the peripheral velocity of the image bearing member, the driving means is configured to be capable of driving the image bearing member and the developer bearing member at, in a first image formation mode, a first peripheral velocity ratio and at, in a second image formation mode with images being formed with an image density higher than in said first image formation mode and/or a tinge larger than in said first image formation mode, a second peripheral velocity ratio which is larger than the first peripheral velocity ratio, characterized in that when Q/S denotes a charge amount per unit area of the developer borne by the developer bearing member, and Δv denotes the peripheral velocity ratio, the first peripheral velocity ratio is set so that |Q/S × Δv| representing a charge amount of the developer transferred from the developer bearing member to the image bearing member is smaller than a developed developer charge amount of the developer per unit area which can be accepted by the image bearing member, and the second peripheral velocity ratio is set so that |Q/S × Δv| is larger than the developed developer charge amount of the developer per unit area which can be accepted by the image bearing member. an image bearing member; a developer bearing member (204, 302) configured to perform a development operation in which an electrostatic image formed on the image bearing member is developed with a developer; driving means (403, 404) configured to rotationally drive the image bearing member and the developer bearing member respectively so that the peripheral velocities of each is variable individually; latent image forming means configured to form an electrostatic image on the image bearing member by forming a light-part potential from a dark-part potential on the image bearing member; and applying means (401, 402) configured to apply a developing bias to the developer bearing member, wherein when a peripheral velocity ratio is defined as a ratio of the peripheral velocity of the developer bearing member to the peripheral velocity of the image bearing member, the driving means is configured to be capable of driving the image bearing member and the developer bearing member at, in a first image formation mode, a first peripheral velocity ratio and at, in a second image formation mode with images being formed with an image density higher than in said first image formation mode and/or a tinge larger than in said first image formation mode, a second peripheral velocity ratio which is larger than the first peripheral velocity ratio, characterized in that when Q/S denotes a charge amount per unit area of the developer borne by the developer bearing member, and Δv denotes the peripheral velocity ratio, the first peripheral velocity ratio is set so that |Q/S × Δv| representing a charge amount of the developer transferred from the developer bearing member to the image bearing member is smaller than a developed developer charge amount of the developer per unit area which can be accepted by the image bearing member, and the second peripheral velocity ratio is set so that |Q/S × Δv| is larger than the developed developer charge amount of the developer per unit area which can be accepted by the image bearing member.