Provided are a balloon catheter that can effectively deliver a drug to living body tissue, a manufacturing method thereof, and a treatment method. A balloon catheter (10) is provided on an outer surface of a balloon (30) with a plurality of elongate bodies (42) which are independent crystals of a water-insoluble drug extending in an elongate form. The elongate bodies 42 include fixed-side elongate bodies (46) which are fixed to the outer surface side of the balloon (30), and top-side elongate bodies (47) which are bent or broken from the fixed-side elongate bodies (46) and are continuous with or independent of the fixed-side elongate bodies (46) .