Connector connection structure and connector

A connector connection structure, comprising:

• a first connector;
• and
• a second connector,
• wherein the first connector and the second connector are fitted to each other at front sides thereof in a fitting direction in which the first connector and the second connector approach to each other,
• wherein the first connector includes:
• a first component including a cylindrical portion having a center axial line of the first component;
• a second component including a main body portion, the main body portion being housed inside the cylindrical portion and internally defining a fitting port to which the second connector is fitted;
• and
• a pair of terminals mounted on the first component and spaced apart from each other in a width direction,
• wherein the second component includes a pair of locking arm portions protruding outwardly from an outer periphery of the main body portion at opposite end portions of the outer periphery in the width direction, the width direction is orthogonal to the fitting direction, each of the locking arm portions has a tip surface, the tip surface facing toward the front side of the first connector in the fitting direction and extending in an up-and-down direction orthogonal to the fitting direction and the width direction,
• wherein the first component includes an abutting surface extending in the up-and-down direction on an inner periphery of the cylindrical portion and facing toward the rear side of the first connector in the fitting direction, the abutting surface being configured to abut on the tip surface of each of the locking arm portions in the fitting direction,
• wherein the second connector includes:
• a housing having a connection portion which is fitted to the fitting port;
• and
• a locking mechanism configured to lock the main body portion and the connection portion with each other, such that a fitted state where the connection portion is fitted to the fitting port is not released,
• wherein the locking mechanism is provided at a location away from the center axial line of the cylindrical portion to one side in the up-and-down direction, and
• wherein the tip surface of each of the pair of locking arm portions is asymmetric in the up-and-down direction such that at least one part of the tip surface in the up-and-down direction first receives a force from the abutting surface when the tip surface of the locking arm portions receives the force on the rear side in the fitting direction from the abutting surface.