A heating apparatus comprising: a heating unit configured to heat a supplied coating material so as to generate coating vapor to be deposited on a coating target object; and a nozzle unit disposed inside the heating unit configured to receive the coating material supplied in solid phase, wherein the solid-phase coating material is heated and phase-changed to liquid in the nozzle unit, and the liquid-phase coating material is discharged from the nozzle unit to the heating unit, wherein the nozzle unit comprises a nozzle formed in one piece with or connected to a lower portion of a coating material supply tube through which the coating material is supplied in solid phase, and the nozzle comprises one or more nozzle openings formed through a sidewall and a closed bottom side thereof, wherein after the solid-phase coating material is heated and phase-changed to liquid in the nozzle, the liquid-phase coating material is discharged from the nozzle through the nozzle openings, wherein the heating apparatus further comprises a shock-absorbing device connected to a lower portion of the nozzle to absorb impact force when the solid-phase coating material falls to the nozzle, wherein the shock-absorbing device comprises a liquid-phase coating material receiving part provided on the closed bottom side of the nozzle and having a height configured to receive the liquid-phase coating material obtained by heating the solid-phase coating material, wherein impact force applied by the solid-phase coating material falling into the nozzle is absorbed while the solid-phase coating material collides with the liquid-phase coating material contained in the liquid-phase coating material receiving part. a heating unit configured to heat a supplied coating material so as to generate coating vapor to be deposited on a coating target object; and a nozzle unit disposed inside the heating unit configured to receive the coating material supplied in solid phase, wherein the solid-phase coating material is heated and phase-changed to liquid in the nozzle unit, and the liquid-phase coating material is discharged from the nozzle unit to the heating unit, wherein the nozzle unit comprises a nozzle formed in one piece with or connected to a lower portion of a coating material supply tube through which the coating material is supplied in solid phase, and the nozzle comprises one or more nozzle openings formed through a sidewall and a closed bottom side thereof, wherein after the solid-phase coating material is heated and phase-changed to liquid in the nozzle, the liquid-phase coating material is discharged from the nozzle through the nozzle openings, wherein the heating apparatus further comprises a shock-absorbing device connected to a lower portion of the nozzle to absorb impact force when the solid-phase coating material falls to the nozzle, wherein the shock-absorbing device comprises a liquid-phase coating material receiving part provided on the closed bottom side of the nozzle and having a height configured to receive the liquid-phase coating material obtained by heating the solid-phase coating material, wherein impact force applied by the solid-phase coating material falling into the nozzle is absorbed while the solid-phase coating material collides with the liquid-phase coating material contained in the liquid-phase coating material receiving part.