A sensor device comprising: a rod member including an axially extending fluid passage , the fluid passage being formed inside the rod member and configured such that fluid flows into the fluid passage ; a temperature sensor having a rod shape and thinner than the fluid passage , the temperature sensor being inserted in the fluid passage with a distal end of the temperature sensor being located inside the fluid passage , the temperature sensor being configured to detect a temperature of the fluid; a pressure sensor communicating with the fluid passage , the pressure sensor being configured to detect a pressure of the fluid; wherein the fluid passage is configured such that the fluid flows from the distal end of the temperature sensor toward a proximal end of the temperature sensor , the fluid passage includes a helically shaped passage disposed upstream of a location in communication with the pressure sensor , and a linear passage continuous to an upstream side of the helically shaped passage , the sensor device furthermore comprising a fixing member configured to fix the proximal end of the temperature sensor ; and a retention member , wherein the retention member is disposed in the linear passage , the retention member includes an upstream retention member that retains the distal end of the temperature sensor and blocks the linear passage , and a downstream retention member that retains a portion of the temperature sensor closer to the proximal end than the distal end and blocks the linear passage , a communication hole into which the fluid is allowed to flow is disposed in a side portion of the rod member corresponding to the linear passage between the upstream retention member and the downstream retention member , and a communication hole into which the fluid is allowed to flow is disposed in a side portion of the rod member corresponding to the linear passage downstream of the downstream retention member . a rod member including an axially extending fluid passage , the fluid passage being formed inside the rod member and configured such that fluid flows into the fluid passage ; a temperature sensor having a rod shape and thinner than the fluid passage , the temperature sensor being inserted in the fluid passage with a distal end of the temperature sensor being located inside the fluid passage , the temperature sensor being configured to detect a temperature of the fluid; a pressure sensor communicating with the fluid passage , the pressure sensor being configured to detect a pressure of the fluid; wherein the fluid passage is configured such that the fluid flows from the distal end of the temperature sensor toward a proximal end of the temperature sensor , the fluid passage includes a helically shaped passage disposed upstream of a location in communication with the pressure sensor , and a linear passage continuous to an upstream side of the helically shaped passage , the sensor device furthermore comprising a fixing member configured to fix the proximal end of the temperature sensor ; and a retention member , wherein the retention member is disposed in the linear passage , the retention member includes an upstream retention member that retains the distal end of the temperature sensor and blocks the linear passage , and a downstream retention member that retains a portion of the temperature sensor closer to the proximal end than the distal end and blocks the linear passage , a communication hole into which the fluid is allowed to flow is disposed in a side portion of the rod member corresponding to the linear passage between the upstream retention member and the downstream retention member , and a communication hole into which the fluid is allowed to flow is disposed in a side portion of the rod member corresponding to the linear passage downstream of the downstream retention member . <EOS>