A stent supply instrument (1, 10, 20, 30, 40, 53, 56) includes: a plurality of loops (2A) formed by spirally winding a wire or a strand wire made of a resin joint portions (2B) that joint the loops to each other along a common center line (C) and a deformation holding section (3, 13, 21, 31, 41, 50, 55) that holds a deformed shape of a stent (2) detained in a coelom while holding the jointed state of the loops so that a projection area (P) of the loops after deformation projected onto a virtual plane perpendicular to the center axis is smaller than the projection area of the loops before deformation projected onto the virtual plane. Here, the stent is released from the deformation holding section by means of a relative movement between the deformation holding section and the stent.
