A development apparatus includes a developer carrier to develop an electrostatic latent image using a developer, a first and second developer supply members each to supply the developer to the developer carrier. Hs1, Δ1, t1, Hs2, Δ2, and t2 satisfy a following formula below, 10≦Hs1×(Δ1/t1)+Hs2×(Δ2/t2)≦50 Herein, Hs1 is a hardness of the outer peripheral surface of the first developer supply member, t1 is a layer thickness of an elastic layer of the first developer supply member, Δ1 is an NIP amount that is determined when the first developer supply member is in press-contact with the developer carrier, Hs2 is a hardness of the outer peripheral surface of the second developer supply member, t2 is a layer thickness of an elastic layer of the second developer supply member, and Δ2 is an NIP amount that is determined when the second developer supply member is in press-contact with the developer carrier.