A developing apparatus includes a developing container including a first chamber having a developer carrying member for carrying developer and a second chamber disposed in an inclined manner to which toner is supplied. First and second communicating portions supply developer between longitudinal end sides of the first and second chambers. A ceiling portion of one end side of the second chamber is disposed lower than a ceiling portion of one end side of the first chamber. A developer supplying screw supplies the toner to the second chamber through a supply port provided in a bottom of a developer supplying path. The supply port is disposed in a position lower than the ceiling portion and is located at an upper portion on a downstream side of the first communicating portion in a developer conveying direction on one end side of the chamber.