A vehicle lamp unit (10, 110) comprising: a light emitting device disposed adjacent to a base point on an optical axis (Ax) extending in a front-rear direction of a vehicle on which the vehicle lamp unit (10, 110) is mounted; and a transparent member (14, 114) disposed in front of the light emitting device, wherein the light emitting device comprises a light emitting surface arranged to face forward, wherein the transparent member (14, 114) is configured such that light emitted by the light emitting device enters the transparent member (14, 114) and is internally reflected by a front surface (14a, 114a) of the transparent member (14, 114), and such that the light reflected by the front surface (14a, 114a) is internally reflected again by a rear surface (14b, 114b) of the transparent member (14, 114) and emitted from the front surface (14a, 114a) of the transparent member (14, 114), wherein the light emitting surface comprises a straight bottom side edge (12A1) disposed on and along a horizontal line perpendicular to the optical axis (Ax), characterized in that the front surface (14a, 114a) of the transparent member (14, 114) is a flat surface facing obliquely upward and including another horizontal line perpendicular to the optical axis (Ax), wherein the rear surface (14b, 114b) of the transparent member (14, 114) comprises a light reflection control surface configured based on a paraboloidal reference surface having a focal point at a position symmetric with the base point with respect to the flat surface and having a center axis directed forward and inclined upward with respect to the optical axis (Ax), wherein a central area (14a1,) of the front surface (14a, 114a) has a range centered above the optical axis (Ax) and is a mirrored surface, wherein the light reflection control surface is a mirrored surface, wherein the light reflection control surface comprises a first zone positioned obliquely downward on an ongoing lane side with respect to the optical axis (Ax), wherein the first zone is divided into an inner zone (Z1i) and an outer zone (Z1o) by a curve line, the curve line being convex toward the optical axis (Ax) when observed from a front of the vehicle, and wherein the inner zone (Z1i) is configured to reflect light to form an oblique cutoff line extending obliquely upward on the ongoing lane side. a light emitting device disposed adjacent to a base point on an optical axis (Ax) extending in a front-rear direction of a vehicle on which the vehicle lamp unit (10, 110) is mounted; and a transparent member (14, 114) disposed in front of the light emitting device, wherein the light emitting device comprises a light emitting surface arranged to face forward, wherein the transparent member (14, 114) is configured such that light emitted by the light emitting device enters the transparent member (14, 114) and is internally reflected by a front surface (14a, 114a) of the transparent member (14, 114), and such that the light reflected by the front surface (14a, 114a) is internally reflected again by a rear surface (14b, 114b) of the transparent member (14, 114) and emitted from the front surface (14a, 114a) of the transparent member (14, 114), wherein the light emitting surface comprises a straight bottom side edge (12A1) disposed on and along a horizontal line perpendicular to the optical axis (Ax), characterized in that the front surface (14a, 114a) of the transparent member (14, 114) is a flat surface facing obliquely upward and including another horizontal line perpendicular to the optical axis (Ax), wherein the rear surface (14b, 114b) of the transparent member (14, 114) comprises a light reflection control surface configured based on a paraboloidal reference surface having a focal point at a position symmetric with the base point with respect to the flat surface and having a center axis directed forward and inclined upward with respect to the optical axis (Ax), wherein a central area (14a1,) of the front surface (14a, 114a) has a range centered above the optical axis (Ax) and is a mirrored surface, wherein the light reflection control surface is a mirrored surface, wherein the light reflection control surface comprises a first zone positioned obliquely downward on an ongoing lane side with respect to the optical axis (Ax), wherein the first zone is divided into an inner zone (Z1i) and an outer zone (Z1o) by a curve line, the curve line being convex toward the optical axis (Ax) when observed from a front of the vehicle, and wherein the inner zone (Z1i) is configured to reflect light to form an oblique cutoff line extending obliquely upward on the ongoing lane side.