An image formation apparatus has a waste toner accommodation unit including a toner transporting rotation member covered with a fixed pipe. As the member rotates, waste toner in the pipe is transported downstream. The toner transporting rotation member has an upstream portion with a recessed portion having a small diameter. As the toner transporting rotation member rotates, a detection plate located external to the waste toner accommodation unit repetitively moves and thus repetitively passes across a photo sensor. When the waste toner has reached the level of the pipe the waste toner is compressed in the pipe downstream and thus increases in density. This increases a load torque of the toner transporting rotation member and hence ruptures the recessed portion, and thus stops rotation. The photo sensor detects that the detection plate no longer passes across it, and thus detects a state full of toner.