A cable connector assembly suitable for interconnecting a high intensity discharge bulb and a circuit unit, the connector cable assembly comprising: a cable-side connector configured to be electrically connected to a bulb-side connector provided in the HID bulb; a cable body connected to the cable-side connector; a cover member surrounding an outer circumferential surface of the cable-side connector and being opened on one surface so that a connection terminal surface of the cable-side connector is exposed, the cover member including an opening; and a locking member configured to bring the cover member into engagement with the bulb-side connector, wherein the cover member is configured to define a gap between the cable-side connector and the cover member such that the bulb-side connector is fitted to the gap when the cable-side connector is connected to the bulb-side connector, the locking member includes a slide portion arranged to slide along an outer circumferential surface of the cover member, the slide portion being provided with a protrusion inserted into the opening of the cover member and configured to engage with a locking hole formed in the bulb-side connector; the cable connector assembly being characterized in that: the slide portion includes a flexing piece configured to be flexed to displace the protrusion; the flexing piece includes a slant bump protruding into the gap through a top portion of the cover member, the slant bump having a slope; the cover member further includes a slant guide piece formed in the top portion of the cover member, the slant guide piece having a slope; the locking member further includes a bent portion extending in a direction opposite to the slide direction of the slide portion and bent in a position spaced apart from the cover member; and when the slide portion is caused to slide along the outer circumferential surface of the cover member by the bent portion being pressed, the flexing piece is flexed away from the cover member as the slope of the slant bump is slid along the slope of the slant guide piece, such that the protrusion is displaced by the flexing piece, with the protrusion being moved away from the cable-side connector and disengaged from the locking hole. a cable-side connector configured to be electrically connected to a bulb-side connector provided in the HID bulb; a cable body connected to the cable-side connector; a cover member surrounding an outer circumferential surface of the cable-side connector and being opened on one surface so that a connection terminal surface of the cable-side connector is exposed, the cover member including an opening; and a locking member configured to bring the cover member into engagement with the bulb-side connector, wherein the cover member is configured to define a gap between the cable-side connector and the cover member such that the bulb-side connector is fitted to the gap when the cable-side connector is connected to the bulb-side connector, the locking member includes a slide portion arranged to slide along an outer circumferential surface of the cover member, the slide portion being provided with a protrusion inserted into the opening of the cover member and configured to engage with a locking hole formed in the bulb-side connector; the cable connector assembly being characterized in that: the slide portion includes a flexing piece configured to be flexed to displace the protrusion; the flexing piece includes a slant bump protruding into the gap through a top portion of the cover member, the slant bump having a slope; the cover member further includes a slant guide piece formed in the top portion of the cover member, the slant guide piece having a slope; the locking member further includes a bent portion extending in a direction opposite to the slide direction of the slide portion and bent in a position spaced apart from the cover member; and when the slide portion is caused to slide along the outer circumferential surface of the cover member by the bent portion being pressed, the flexing piece is flexed away from the cover member as the slope of the slant bump is slid along the slope of the slant guide piece, such that the protrusion is displaced by the flexing piece, with the protrusion being moved away from the cable-side connector and disengaged from the locking hole. the slide portion includes a flexing piece configured to be flexed to displace the protrusion; the flexing piece includes a slant bump protruding into the gap through a top portion of the cover member, the slant bump having a slope; the cover member further includes a slant guide piece formed in the top portion of the cover member, the slant guide piece having a slope; the locking member further includes a bent portion extending in a direction opposite to the slide direction of the slide portion and bent in a position spaced apart from the cover member; and when the slide portion is caused to slide along the outer circumferential surface of the cover member by the bent portion being pressed, the flexing piece is flexed away from the cover member as the slope of the slant bump is slid along the slope of the slant guide piece, such that the protrusion is displaced by the flexing piece, with the protrusion being moved away from the cable-side connector and disengaged from the locking hole.