PROBLEM TO BE SOLVED: To provide a cartridge type dental handpiece, capable of reducing component costs to lessen a users burden, achieving an air mixed quantitative jet of two fluids, water and the air, and simplifying and facilitating maintenance work and cleaning work.SOLUTION: Water and the air are supplied from a handpiece body 2 side to a handpiece head part 11, and a storing area 12 for a cartridge housing 21, the lower end face inner peripheral side of which is opened is formed in the interior. The outlet side of one communicating passage 13 communicated with one fluid passage 3 is faced on the inner wall surface forming the storing area 12, and the outlet side of another communicating passage 14 communicated with another fluid passage 4 is taken as another fluid jet orifice 15 opened at the lower end face 11a. In the storing area 12 of the handpiece head part 11, the handpiece head part 11 is removably mounted with the lower end face 21a facing to the inside of the lower end face 11a.
