Provided is a medical device capable of acquiring medical information with which high usability can be maintained even while having an over-the-wire structure. The medical device (1), which has an imaging function, comprises: a shaft body section (22) wherein an image lumen (25) and a guide wire lumen (26) are formed with a double lumen structure from the tip to the base end, with the base end section of the shaft body section (22) branching into a first shaft base end section (222) in which the image lumen (25) is disposed and a second shaft base end section (223) in which the guide wire lumen (26) is disposed； a shaft tip section (21) wherein a common lumen structure in which the image lumen (25) and the guide wire lumen (26) merge is formed in the leading end section； a hub (5) provided with a first hub section (51) connected to the first shaft base end section (222) and a second hub section (52) connected to the second shaft base end section (223)； and a transducer unit (41) fixed to a drive shaft (42). When the axial line of the shaft body section (22) is called a reference line X, the slope of the central axis Y1 of the first hub section (52) with respect to the reference line X is θ1, and the slope of the central axis Y2 of the second hub section (52) with respect to the reference line X is θ2, │θ1│>；│θ2│ is satisfied.L'invention concerne un dispositif médical permettant d'acquérir des informations médicales avec lequel une facilité élevée d'utilisation peut être maintenue même en ayant une structure du type sur fil-guide. Le dispositif médical (1), qui a une fonction d'imagerie, comprend : une section (22) de corps de tige, une lumière (25) d'image et une lumière (26) de fil-guide faisant partie d'une structure à double lumière allant de la pointe à l'extrémité de base, la section d'extrémité de base de la section (22) de corps de tige se ramifiant en une première section (222) d'extrémité de base de tige dans laquelle est disposée la lumière (25) d'image
