A developing apparatus comprising: a developer bearing member for bearing developer (T); a developer housing chamber for housing the developer (T) to be supplied to the developer bearing member ; a stirring member which includes a sheet-like stirring portion and a rotary shaft to which the stirring portion is attached; and a first electrode and a second electrode which are used to detect an amount of the developer (T) and which are arranged with an interval (X1) therebetween, wherein an area (X1) between the first electrode and the second electrode in a surface of the developer housing chamber is positioned below a center of the rotary shaft of the stirring member and below a lower end of the developer bearing member when the developing apparatus is mounted in an image forming apparatus, and the sheet-like stirring portion comes into contact with the area (X1) due to rotation of the stirring member , characterized in that the lower end of the developer bearing member is positioned above the center of the rotary shaft of the stirring member when the developing apparatus is mounted in the image forming apparatus, the first electrode , the second electrode , and the area (X1) are arranged in the following order in a rotational direction of the stirring member below the center of the rotary shaft when the developing apparatus is mounted in the image forming apparatus: the second electrode , the area (X1), and the first electrode , and the sheet-like stirring portion comes into contact with the second electrode , the area (X1), and the first electrode in this order due to rotation of the stirring member . a developer bearing member for bearing developer (T); a developer housing chamber for housing the developer (T) to be supplied to the developer bearing member ; a stirring member which includes a sheet-like stirring portion and a rotary shaft to which the stirring portion is attached; and a first electrode and a second electrode which are used to detect an amount of the developer (T) and which are arranged with an interval (X1) therebetween, wherein an area (X1) between the first electrode and the second electrode in a surface of the developer housing chamber is positioned below a center of the rotary shaft of the stirring member and below a lower end of the developer bearing member when the developing apparatus is mounted in an image forming apparatus, and the sheet-like stirring portion comes into contact with the area (X1) due to rotation of the stirring member , characterized in that the lower end of the developer bearing member is positioned above the center of the rotary shaft of the stirring member when the developing apparatus is mounted in the image forming apparatus, the first electrode , the second electrode , and the area (X1) are arranged in the following order in a rotational direction of the stirring member below the center of the rotary shaft when the developing apparatus is mounted in the image forming apparatus: the second electrode , the area (X1), and the first electrode , and the sheet-like stirring portion comes into contact with the second electrode , the area (X1), and the first electrode in this order due to rotation of the stirring member . <EOS>