To provide a new dental treatment apparatus which separately keeps a space for operating a mouse without making a table large and enables a smooth treatment using a computer monitor device.

This dental treatment apparatus is equipped with a treatment table 2, the computer monitor device 12 placed in the peripheral part, and a body table 10 which is supported by a moving arm 11 to keep a horizontal state and moves in the neighbor hood area of the treatment table 2. An auxiliary table 13 for operating to move the mouse (m) for controlling the computer monitor device 12 is accommodated and retained under the body table 10 to be taken out in the neighborhood of the side of the body table 10, and is kept in the horizontal state when taken out in the neighborhood of the side of the body table 10.