A connector comprises first contacts, second contacts and a housing. The first contacts have first contact portions which come into contact with first mating contacts. The second contacts have second contact portions which come into contact with second mating contacts. The housing has at least two long wall portions and at least one supporting portion. The long wall portions extend in an X-direction and are disposed apart from each other in a Y-direction to form a slot between the two of the long wall portions. The supporting portion protrudes in a Z-direction from one of the long wall portions and has a plate-like shape extending in the X-direction. The first contact portions are supported by the supporting portion. The second contact portions are located in the slot at least in part.