To provide a connector block capable of preventing even connectors slightly differing in, for example, width from being assembled in a wrong manner, and a connector housing structure of the connector block.SOLUTION: A connector block 1 at least has a first connector housing part 34 and a second connector housing part 35. The first connector housing part 34 regularly houses the first connector. Further, the second connector housing part 35 regularly houses the second connector 4. If the connector block 1 has the second connector 4 inserted into the first connector housing part 34, the wrong assembling is found and is thereby prevented. Specifically, as for the wrong assembling prevention, the second connector 4 enters a space 52 between a pair of step parts 49 at the first connector housing part 34 inside the first connector housing part 34 to enter a rattle state, and the wrong assembling is thus found from the rattle state.SELECTED DRAWING: Figure 8
展开▼