A developing apparatus including a developer container which contains a first developer having a first charging polarity and a second developer having a second charging polarity opposite to the first charging polarity, a developer bearing member which bears the first and the second developers, a layer forming device which forms a first layer substantially composed of the first developer on the developer bearing member and forms a second layer composed of the first and the second developers on the first layer, a separating member which is provided downstream of the layer forming device and upstream of a developing position in a developer bearing and conveying direction of the developer bearing member to separate the second layer from the developer bearing member, whereby plural kinds of developers can be selectively supplied for a development.