Development device and image forming apparatus including the development device

A development device comprising:

• a development housing in which a nonmagnetic one-component toner is stored;
• a development roller formed by a cylindrical elastic body, supported by the development housing in a rotatable manner, disposed so as to face a photosensitive drum at a development nip area, and having a circumferential face on which the toner is carried;
• a supply roller including a metal shaft member and a cylindrical foamed elastic body provided around the shaft member, supported by the development housing in a rotatable manner, coming into contact with the circumferential face of the development roller to form a supply nip area between the supply roller and the development roller, supplying the toner to the development roller and collecting the toner from the development roller;
• and
• a layer thickness regulating member coming into contact with the circumferential face of the development roller on a downstream side of the supply nip area in a rotational direction of the development roller and regulating a thickness of the toner on the development roller, wherein
• the supply roller has an electric resistance within a range of 1×102Ω or more and 1×104Ω or less, and
• the supply roller comes into contact with the circumferential face of the development roller in a state where a compression load within a range of 0.2 N or more and 1.5 N or less is applied to the shaft member of the supply roller in a direction perpendicular to an axial direction of the shaft member.