Turbocharger

A turbocharger comprising:

• a housing configured to accommodate a compressor wheel, including:
• a suction passage formed in the housing, the suction passage including a suction port;
• an exhaust passage formed in the housing, the exhaust passage communicated with the suction passage via the compressor wheel and including an exhaust port;
• a sub passage branched from between the compressor wheel and the exhaust port in the exhaust passage, having an opening configured for a valve to be mounted to open and close the sub passage;
• a first tube communicated to the sub passage, including a first opening formed at a tip end of the first tube to be opened toward an outside of the housing;
• and
• a second tube communicated to the suction passage, branched from between the suction port and the compressor wheel in the suction passage, and including a second opening formed at a tip end of the second tube to be opened toward the outside of the housing;
• and
• a backflow pipe including a first end portion detachably connected to the first tube and a second end portion detachably connected to the second tube, configured to fluidly connect between the first tube and the second tube, wherein
• the second tube protrudes from a wall of the suction passage substantially in a same direction in which the first tube protrudes from a wall of the sub passage toward the first opening, and
• the second opening is visibly provided from a position where the first opening is seen from an outside of the first opening in a state where the backflow pipe has been removed from the first opening and the second opening.