To provide a dental mixer capable of easily, certainly locking a mixing tip to a syringe body, easily removing the mixing tip, and thereby having easy handling property. The dental mixer includes a syringe body 1 and a sleeve 3. The mixing tip 2 includes a housing 2a, a paste guiding member 2b and a plate spring-shaped locking members 2c and 2c. The plate spring-shaped locking members 2c and 2c have pawl portions 2ca and 2ca on the tip-end side thereof, and the pawl portions 2ca and 2ca are locked, by elasticity, with locking grooves 1c and 1c between the syringes 1a and 1a. The sleeve 3 has a shape to cover at least the pawl portions 2ca and 2ca when sliding toward the outlet side of the housing 2a, and thereby to prevent the locking of the pawl portions 2ca and 2ca by elasticity from canceling.