A tire valve unit comprising: a tire valve including a valve stem and a rubber body located on a periphery of the valve stem, the tire valve including a first axial end and a second axial end; and a sensor unit including a sensor that detects a condition of a tire mounted on a wheel and a housing that accommodates the sensor, and the sensor unit is secured to the tire valve, wherein the tire valve unit is mounted on the wheel by press-fitting the tire valve into a mounting hole in the wheel from the first axial end, the body includes an opposed portion that is opposed to an inner surface of the mounting hole with the tire valve unit mounted on the wheel, a proximal end portion located closer to the second axial end of the tire valve than the opposed portion, and an attaching portion including the opposed portion and the proximal end portion, the tire valve includes an attaching projection that projects in the axial direction of the tire valve from the inside of the attaching portion toward the outside of the attaching portion, and the tire valve unit further includes a fixture that secures the attaching projection to the housing, characterized by a support portion incorporated in the proximal end portion, wherein the support portion is annular and coaxial with the tire valve; the valve stem extends through the center of the support portion; the attaching projection is integrally formed with the support portion and extends from the support portion in the axial direction of the tire valve. a tire valve including a valve stem and a rubber body located on a periphery of the valve stem, the tire valve including a first axial end and a second axial end; and a sensor unit including a sensor that detects a condition of a tire mounted on a wheel and a housing that accommodates the sensor, and the sensor unit is secured to the tire valve, wherein the tire valve unit is mounted on the wheel by press-fitting the tire valve into a mounting hole in the wheel from the first axial end, the body includes an opposed portion that is opposed to an inner surface of the mounting hole with the tire valve unit mounted on the wheel, a proximal end portion located closer to the second axial end of the tire valve than the opposed portion, and an attaching portion including the opposed portion and the proximal end portion, an opposed portion that is opposed to an inner surface of the mounting hole with the tire valve unit mounted on the wheel, a proximal end portion located closer to the second axial end of the tire valve than the opposed portion, and an attaching portion including the opposed portion and the proximal end portion, the tire valve includes an attaching projection that projects in the axial direction of the tire valve from the inside of the attaching portion toward the outside of the attaching portion, and the tire valve unit further includes a fixture that secures the attaching projection to the housing, characterized by a support portion incorporated in the proximal end portion, wherein the support portion is annular and coaxial with the tire valve; the valve stem extends through the center of the support portion; the attaching projection is integrally formed with the support portion and extends from the support portion in the axial direction of the tire valve.