A throttle grip device having a case attached to a handlebar of a vehicle, a throttle grip extending in an axial direction of the handlebar from the case, a first interlocking member, and a first urging member, wherein the throttle grip is rotatable in a normal direction that is one direction from an initial position around an axis of the handlebar and is rotatable in an opposite direction that is the other direction from the initial position around the axis of the handlebar, the first interlocking member is rotatable in conjunction with rotation in the normal direction and rotation in the opposite direction of the throttle grip, in a case where the first interlocking member rotates in the normal direction, the first urging member urges the first interlocking member toward the initial position, in a case where the throttle grip rotates in the normal direction, the vehicle exerts a throttle control function, and in a case where the throttle grip rotates in the opposite direction, the vehicle deactivates a cruise control function, the throttle grip comprising: a second interlocking member that is rotatable in conjunction with the rotation in the opposite direction of the throttle grip; and a second urging member that urges the second interlocking member toward the initial position, in a case where the second interlocking member rotates in the opposite direction, wherein the first urging member includes a coil-shaped torsion spring, the first urging member and the second urging member are arranged side by side in the axial direction of the handlebar, wherein the throttle grip device further comprises an inner case that houses the second interlocking member in an inside, wherein the inner case includes a stopper portion (15c; 15c'; 15c") that protrudes toward the inside, the second urging member urges the second interlocking member in the normal direction, the second interlocking member includes a locking portion which engages with the second urging member and a protrusion (16b; 16b'; 16b") which abuts the stopper portion (15c; 15c'; 15c"), and the protrusion (16b; 16b'; 16b") is arranged on an opposite side of the locking portion with respect to a first line which is orthogonal to a second line connecting the locking portion and a rotation axis of the second urging member and passes across the rotation axis, wherein a rotation axis of the first interlocking member and a rotation axis of the second interlocking member are in range with each other, and the second interlocking member stores a part of the first interlocking member, characterised in that in a case where the throttle grip rotates in the normal direction, the second interlocking member does not rotate, and the second urging member continuously urges the second interlocking member in the normal direction while not being deformed. a second interlocking member that is rotatable in conjunction with the rotation in the opposite direction of the throttle grip; and a second urging member that urges the second interlocking member toward the initial position, in a case where the second interlocking member rotates in the opposite direction, wherein the first urging member includes a coil-shaped torsion spring, the first urging member and the second urging member are arranged side by side in the axial direction of the handlebar, wherein the throttle grip device further comprises an inner case that houses the second interlocking member in an inside, wherein the inner case includes a stopper portion (15c; 15c'; 15c") that protrudes toward the inside, the second urging member urges the second interlocking member in the normal direction, the second interlocking member includes a locking portion which engages with the second urging member and a protrusion (16b; 16b'; 16b") which abuts the stopper portion (15c; 15c'; 15c"), and the protrusion (16b; 16b'; 16b") is arranged on an opposite side of the locking portion with respect to a first line which is orthogonal to a second line connecting the locking portion and a rotation axis of the second urging member and passes across the rotation axis, wherein a rotation axis of the first interlocking member and a rotation axis of the second interlocking member are in range with each other, and the second interlocking member stores a part of the first interlocking member,