An aspiration catheter (10) includes an aspiration tube (24) and an aspiration lumen (24a) extending between and opening to the distal and proximal ends of the aspiration tube, and a guidewire tube (20) bonded to the outer surface of the aspiration tube on a distal end portion of the aspiration tube, with at least a portion of the guidewire tube being parallel to the aspiration tube. A guidewire lumen (20a) extends through the guidewire tube and opens at a proximal opening (22) located at a proximal end of the guidewire tube. The outer surface of the aspiration tube has a flat portion (40) where the outer surface is parallel to an axial direction of the aspiration lumen, and the proximal opening of the guidewire lumen is located at the flat portion of the outer surface of the aspiration tube.
