There is provided a bed device comprising: a support plate； a spring mattress provided on the support plate； a mat provided on the spring mattress； and a hot-air supply device for supplying hot air into the spring mattress, wherein the hot-air supply device is received in the spring mattress, wherein the hot-air supply device includes: a hot-air generation unit for generating hot-air； a hot-air discharge tube protruding from the hot-air generation unit by a predetermined length to discharge the hot-air generated in the hot-air generation unit into the spring mattress； and two hot-air guide members symmetrically disposed about the hot-air discharge tube, wherein the two air guide members are configured to guide the hot-air such that the hot air discharged from the hot-air discharge tube is distributed uniformly over an entire area of the spring mattress.
