A device having a tube for heating or heat retaining of fluid includes a first path in which a connection section of a cord heater led out of the tube and a lead wire connected to a power supply is provided, a second path provided between the tube and the first path, and a drainage path for removing leaked fluid of the second path. In this device, the connection section is sandwiched by a pair of first sealing members to retain a sealed state and the cord heater passes through the second path in a sealed state by a second sealing member. This device can effectively prevent gas or liquid from leaking into the space where the connection section of a lead wire and a cord heater is provided.