Connector

1. A connector comprising:

a pair of housings to be fitted to each other by inserting an insertion part of one housing into a tubular part of another housing,

wherein on an outer peripheral surface of the insertion part of the one housing, a plurality of outer ribs which project from the outer peripheral surface are provided separately in a circumferential direction to extend from a front distal end of the insertion part to a rear side,

wherein on an inner peripheral surface of the tubular part of the other housing, a plurality of inner ribs which project from the inner peripheral surface are provided separately in a circumferential direction to extend from a front distal end of the tubular part to a rear side,

wherein the plurality of outer ribs are provided, on the outer peripheral surface of the insertion part, at a center portion of a lower portion in a width direction, a portion closer to one side of the width direction than a center portion of the upper portion in the width direction, and a portion closer to the other side of the width direction than the center portion of the upper portion,

wherein the plurality of inner ribs are provided, on the inner peripheral surface of the tubular part, at a center portion of a lower portion in a width direction, a portion closer to one side of the width direction than a center portion of the upper portion in the width direction, and a portion closer to the other side of the width direction than the center portion of the upper portion,

wherein in a state in which the pair of housings are fitted, all of the outer ribs and the inner ribs corresponding to each other are arranged adjacently in the circumferential direction, and

wherein the adjacent outer ribs and the inner ribs are provided such that positions in the circumferential direction are deviated from each other, wherein the plurality of outer ribs which project from the outer peripheral surface are provided separately in the circumferential direction to extend from the front distal end of the insertion part to a rear end of the insertion part.

2. The connector according to claim 1 ,

wherein the outer ribs are arranged at positions which are plane-symmetrical to a plane passing through a geometric center of the outer peripheral surface of the insertion part, and

wherein the inner ribs are arranged at positions which are plane-symmetrical to a plane passing through a geometric center of the inner peripheral surface of the tubular part.

3. The connector according to claim 1 ,

wherein the outer ribs are formed in a stepped shape having an increased projection height from a position separated by a set distance from the front end of the insertion part to the rear side, or the inner ribs are formed in a stepped shape having an increased projection height from a position separated by a set distance from the front end of the tubular part to the rear side.

4. The connector according to claim 1 ,

wherein the pair of housings comprise: cavities, each of which houses a terminal; and a pair of resin tubular bodies which are supported by the housings such that openings of the cavities are positioned inside the tubular bodies and which are fitted to each other,

wherein an annular protrusion is provided over an entire periphery on one surface of surfaces of the pair of tubular bodies which face each other when the pair of tubular bodies are fitted, and contacts another surface of the surfaces, and

wherein the annular protrusion comprises an inclined surface which is lowered from a front end side of the tubular body toward a rear end side.