A vehicle door lock device comprising: a base member with a first stopper member and a second stopper member, a rotating lever, a position holding device (25i, 91a, 91b, 25g, 26) for the rotating lever, which is rotatably supported by the base member in a manner that the rotating lever abuts against the first stopper member to be held at a first position, and abuts against the second stopper member to be held at a second position; and a torsion spring that is interposed between the rotating lever and the base member, urges the rotating lever toward the first stopper member at the first position, and urges the rotating lever toward the second stopper member at the second position, the position holding device (25i, 91a, 91b, 25g, 26) being capable of holding the rotating lever elastically at two positions including the first position and the second position, wherein the torsion spring comprises: a coiled part supported by the base member; and a first arm part and a second arm part each extending from the coiled part in a radial direction thereof, the first arm part and the second arm part facing each other across an engagement portion provided to the rotating lever, wherein the first arm part comprises a mountain portion (26b1) comprising a top portion that is brought into engagement with the engagement portion in a manner that the engagement portion climbs over the top portion at an intermediate part of a circular-arc locus formed along with rotation of the rotating lever from the first position to the second position, the mountain portion (26b1) urging the rotating lever toward the first stopper member when the rotating lever is held at the first position, and urging the rotating lever toward the second stopper member when the rotating lever is held at the second position, characterized in that the second arm part comprises an urging portion (26c1) that is brought into engagement with the engagement portion when the rotating lever rotates at least from the intermediate part to the first position, the urging portion (26c1) urging the rotating lever toward the second stopper member with an urging force smaller than an urging force exerted by the first arm part toward the first stopper member when the rotating lever is held at the first position. a base member with a first stopper member and a second stopper member, a rotating lever, a position holding device (25i, 91a, 91b, 25g, 26) for the rotating lever, which is rotatably supported by the base member in a manner that the rotating lever abuts against the first stopper member to be held at a first position, and abuts against the second stopper member to be held at a second position; and a torsion spring that is interposed between the rotating lever and the base member, urges the rotating lever toward the first stopper member at the first position, and urges the rotating lever toward the second stopper member at the second position, the position holding device (25i, 91a, 91b, 25g, 26) being capable of holding the rotating lever elastically at two positions including the first position and the second position, a coiled part supported by the base member; and a first arm part and a second arm part each extending from the coiled part in a radial direction thereof, the first arm part and the second arm part facing each other across an engagement portion provided to the rotating lever, wherein the first arm part comprises a mountain portion (26b1) comprising a top portion that is brought into engagement with the engagement portion in a manner that the engagement portion climbs over the top portion at an intermediate part of a circular-arc locus formed along with rotation of the rotating lever from the first position to the second position, the mountain portion (26b1) urging the rotating lever toward the first stopper member when the rotating lever is held at the first position, and urging the rotating lever toward the second stopper member when the rotating lever is held at the second position, the second arm part comprises an urging portion (26c1) that is brought into engagement with the engagement portion when the rotating lever rotates at least from the intermediate part to the first position, the urging portion (26c1) urging the rotating lever toward the second stopper member with an urging force smaller than an urging force exerted by the first arm part toward the first stopper member when the rotating lever is held at the first position.