A development device which is removably insertable into an image forming apparatus (A), the development device comprising: a housing configured to store developer (T); a developer carrying member configured to carry developer (T); a first conductive member having a first surface for use in detection of an amount of developer (T) stored in the housing based on a change in electrostatic capacitance, the first conductive member extending in a lengthwise direction of the developer carrying member farther than in an insertion direction, the insertion direction being a direction in which the development device is inserted into the image forming apparatus (A); a second conductive member having a second surface facing the first surface , the second conductive member extending in the lengthwise direction of the developer carrying member farther than in the insertion direction; a development contact point electrically connected to the developer carrying member ; a first contact point electrically connected to the first conductive member and electrically connectable to a first main body contact point ; and a second contact point electrically connected to the second conductive member and electrically connectable to a second main body contact point , wherein the first conductive member is closer to the developer carrying member in the insertion direction than the second conductive member and a length of the first conductive member in the lengthwise direction is longer than a length of the second conductive member in the lengthwise direction, wherein the first contact point is disposed on a more inner side than the development contact point in the lengthwise direction, wherein the second contact point is disposed on a more inner side than the first contact point in the lengthwise direction, and wherein the second contact point is closer to a central position (C) in the lengthwise direction of the developer carrying member than the first contact point . a housing configured to store developer (T); a developer carrying member configured to carry developer (T); a first conductive member having a first surface for use in detection of an amount of developer (T) stored in the housing based on a change in electrostatic capacitance, the first conductive member extending in a lengthwise direction of the developer carrying member farther than in an insertion direction, the insertion direction being a direction in which the development device is inserted into the image forming apparatus (A); a second conductive member having a second surface facing the first surface , the second conductive member extending in the lengthwise direction of the developer carrying member farther than in the insertion direction; a development contact point electrically connected to the developer carrying member ; a first contact point electrically connected to the first conductive member and electrically connectable to a first main body contact point ; and a second contact point electrically connected to the second conductive member and electrically connectable to a second main body contact point , wherein the first conductive member is closer to the developer carrying member in the insertion direction than the second conductive member and a length of the first conductive member in the lengthwise direction is longer than a length of the second conductive member in the lengthwise direction, wherein the first contact point is disposed on a more inner side than the development contact point in the lengthwise direction, wherein the second contact point is disposed on a more inner side than the first contact point in the lengthwise direction, and wherein the second contact point is closer to a central position (C) in the lengthwise direction of the developer carrying member than the first contact point . <EOS>