PROBLEM TO BE SOLVED: To provide a temperature sensor device which is highly safe with no obstacles protruding from a liquid passage and can exhibit increased thermal responsiveness and accuracy, and a liquid circulation device having the temperature sensor device.SOLUTION: A temperature sensor device 1 includes: a connection tube 2, having a body 3 with a liquid flow passage 31 and having a thin part 32 at the outer wall of the body 3 formed thinly for the liquid flow passage 31 a temperature sensor 4 in the thin part 32 of the connection tube 2 and a heat insulating cover 5 over the temperature sensor 4.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】液体流通路に突出する障害物を有することなく、安全性が高いとともに熱応答性及び精度が向上できる温度センサ装置及びこの温度センサ装置を備えた液体循環装置を提供すること。【解決手段】温度センサ装置1は、液体流通路31を有する本体3及びこの本体3の外壁において前記液体流通路31に対して薄肉に形成された薄肉部32を有する連結管2と、前記連結管2の薄肉部32に配設された温度センサ4と、前記温度センサ4を覆う断熱カバー5と、を備えている。【選択図】図1
