A handle assembly for a estraddled vehicle, the handle assembly comprising: a handle post; a handle pipe coupled to one end of the handle post, the handle pipe extending along a right-left direction which is orthogonal to an axial direction of the handle post; and a reinforcement member coupled to the handle post and the handle pipe, wherein, the handle pipe includes a central portion coupled to the handle post, an upper-right stretch extending upward and rightward from the central portion, an upper-left stretch extending upward and leftward from the central portion, a right-grip support extending rightward from the upper-right stretch, a grip member being attached at a right end thereof, and a left-grip support extending leftward from the upper-left stretch, a grip member being attached at a left end thereof; the upper-right stretch and the upper-left stretch of the handle pipe each include: an inner curved portion (62a, 63a) which is continuous with the central portion and is curved; a linear portion (62b, 63b) which linearly extends from the inner curved portion (62a, 63a); and an outer curved portion (62c, 63c) which extends from the linear portion (62b, 63b) and is curved; the reinforcement member is overlaid on the handle post and the handle pipe in a front-rear direction which is orthogonal to the axial direction and the right-left direction; in a cross section orthogonal to a pipe center line of the handle pipe, at least a part of the reinforcement member extends along a peripheral direction of the handle pipe; and the reinforcement member includes a right pipe-overlapping portion that overlaps the upper-right stretch of the handle pipe, a left pipe-overlapping portion that overlaps the upper-left stretch of the handle pipe, and a post-overlapping portion that is connected to the right pipe-overlapping portion and the left pipe-overlapping portion and overlaps an area from the central portion of the handle pipe to the handle post, characterized in that at least one of the right pipe-overlapping portion and the left pipe-overlapping portion of the reinforcement member includes a protrusion that protrudes, in a cross section orthogonal to the pipe center line, from an outer peripheral surface of the handle pipe in a radial direction; the protrusion or protrusions extend in a direction that the pipe center line of the handle pipe extends, and is located neither at an edge of a right end of the right pipe-overlapping portion nor at an edge of a left end of the left pipe-overlapping portion; an outer end (70a1) of the protrusion or protrusions of the reinforcement member regarding the right-left direction overlaps the linear portion (62b, 63b); and the reinforcement member overlaps neither the outer curved portion of the upper-right stretch nor the outer curved portion of the upper-left stretch. a handle post; a handle pipe coupled to one end of the handle post, the handle pipe extending along a right-left direction which is orthogonal to an axial direction of the handle post; and a reinforcement member coupled to the handle post and the handle pipe, wherein, the handle pipe includes a central portion coupled to the handle post, an upper-right stretch extending upward and rightward from the central portion, an upper-left stretch extending upward and leftward from the central portion, a right-grip support extending rightward from the upper-right stretch, a grip member being attached at a right end thereof, and a left-grip support extending leftward from the upper-left stretch, a grip member being attached at a left end thereof; the upper-right stretch and the upper-left stretch of the handle pipe each include: an inner curved portion (62a, 63a) which is continuous with the central portion and is curved; a linear portion (62b, 63b) which linearly extends from the inner curved portion (62a, 63a); and an outer curved portion (62c, 63c) which extends from the linear portion (62b, 63b) and is curved; the reinforcement member is overlaid on the handle post and the handle pipe in a front-rear direction which is orthogonal to the axial direction and the right-left direction; in a cross section orthogonal to a pipe center line of the handle pipe, at least a part of the reinforcement member extends along a peripheral direction of the handle pipe; and the reinforcement member includes a right pipe-overlapping portion that overlaps the upper-right stretch of the handle pipe, a left pipe-overlapping portion that overlaps the upper-left stretch of the handle pipe, and a post-overlapping portion that is connected to the right pipe-overlapping portion and the left pipe-overlapping portion and overlaps an area from the central portion of the handle pipe to the handle post, characterized in that at least one of the right pipe-overlapping portion and the left pipe-overlapping portion of the reinforcement member includes a protrusion that protrudes, in a cross section orthogonal to the pipe center line, from an outer peripheral surface of the handle pipe in a radial direction; the protrusion or protrusions extend in a direction that the pipe center line of the handle pipe extends, and is located neither at an edge of a right end of the right pipe-overlapping portion nor at an edge of a left end of the left pipe-overlapping portion; an outer end (70a1) of the protrusion or protrusions of the reinforcement member regarding the right-left direction overlaps the linear portion (62b, 63b); and the reinforcement member overlaps neither the outer curved portion of the upper-right stretch nor the outer curved portion of the upper-left stretch.