An electrical connector assembled component includes a first connector and a second connector, which can fit and separate to/from each other along an axis. The first connector includes a first housing, and the second connector has a second housing. The first housing has a flexible section formed with a slit groove that penetrates in the radial direction in the fitting tube, and the flexible section has a locking section that protrudes inward in the radial direction from the cylindrical fitting surface. The second housing includes a locked section, in which there is formed an engaging step-like section that contacts with the locking section in the fitting process so as to elastically flex and displace the locking section to allow movement in the fitting direction to the locking position and locks with the locking section in the connector-removal direction.