An infusion device (1) for acting onto a tube set (2) to transport a medical fluid through the tube set (2) comprises a first housing element (10) constituted to receive a tube section (200, 201) of the tube set (2) and a second housing element (11) being movable with respect to the first housing element (10) such that, in a closed position of the second housing element (11), the first housing element (10) and the second housing element (11) are constituted to receive the tube section (200, 201) in between each other. A sensor device (3) is arranged on the first housing element (10) and having a sensor element (30) for measuring a force on the tube section (200, 201) of the tube set (2). Herein it is provided that the sensor device (3) is arranged on the first housing element (10) in an elastically displaceable manner, wherein the sensor device (3) is supported on the first housing element (10) via at least one spring element (33). In this way an infusion device is obtained which may be less prone to variations in the squeezing of a tube section in between the sensor element and a movable housing element, potentially reducing the effort for calibrating infusion devices and increasing the reliability of pressure measurements on a tube section.