To provide a joint unit between a toilet and a drain pipe and capable of easily connecting a drainage section and the drain pipe when a relative position of the drainage section of the toilet and the drain pipe set under the drainage section is changed for the change or the like of the toilet.

The joint unit 10 comprises an upper unit 11 put on the drainage section 7 of the lower part of the toilet 1 and a lower unit 21 put on the drain pipe 8 set under the toilet 1. The upper unit 11 and the lower unit 21 have collar sections 17 and 25 connected to each other. Three hole sections 26 in a vertical row are formed in the collar section 25 of the lower unit 21. Holes 18 of the collar section 17 in the upper unit 11 are fitted to holes 26 to be selected from the three hole sections 26 in a vertical row, and the upper unit 11 is connected to the lower unit 21 with screws 19. The deviation of a position between the drainage section 7 and the drain pipe 8 is thereby absorbed.