A washing/drying machine which has a deodorization function for deodorizing a daily commodity by using ozone, the washing/drying machine comprising: a washing tub having a drain port; a water supply passage through which water is supplied into the washing tub, the water supply passage having a water supply trap portion to retain water therein so as to form a water supply trap for sealing the inside of the washing tub; a drain passage through which water is drained out of the washing tub from the drain port, the drain passage having a drain trap portion to retain water therein so as to form a drain trap for sealing the inside of the washing tub; a heating means which heats ozone contained in the washing tub; a ozone supply means which supplies the ozone into the washing tub; a ozone elimination means which eliminates the ozone supplied into the washing tub; a drying air duct for circulating the air from the washing tub; characterized in that the washing/drying machine further comprises: a separate water passage (39, 41) provided separately from the water supply passage and including the drying air duct for supplying water into the washing tub and to the drain trap portion of the drain passage, and a control means including an operation period setting means which sets a deodorization operation period, the control means being configured to: form traps in the water supply trap portion and the drain trap portion based on an operation start signal, cause the ozone supply means to supply the ozone based on said operation start signal, cause the heating means to heat the air contained in the washing tub to maintain an inside air temperature of the washing tub within a predetermined temperature range, cause the ozone supply means to stop the supply of the ozone and turn on the ozone elimination means a predetermined period before an end of the deodorization operation period so as to eliminate the supplied ozone by the end of the deodorization operation period, supply a predetermined amount of water into the water supply passage to retain water in the water supply trap portion to form a water supply trap, and supply a predetermined amount of water directly into the drain port through the separate water passage (39, 41) to retain water in the drain trap portion to form a drain trap. a washing tub having a drain port; a water supply passage through which water is supplied into the washing tub, the water supply passage having a water supply trap portion to retain water therein so as to form a water supply trap for sealing the inside of the washing tub; a drain passage through which water is drained out of the washing tub from the drain port, the drain passage having a drain trap portion to retain water therein so as to form a drain trap for sealing the inside of the washing tub; a heating means which heats ozone contained in the washing tub; a ozone supply means which supplies the ozone into the washing tub; a ozone elimination means which eliminates the ozone supplied into the washing tub; a drying air duct for circulating the air from the washing tub; characterized in that the washing/drying machine further comprises: a separate water passage (39, 41) provided separately from the water supply passage and including the drying air duct for supplying water into the washing tub and to the drain trap portion of the drain passage, and a control means including an operation period setting means which sets a deodorization operation period, the control means being configured to: form traps in the water supply trap portion and the drain trap portion based on an operation start signal, cause the ozone supply means to supply the ozone based on said operation start signal, cause the heating means to heat the air contained in the washing tub to maintain an inside air temperature of the washing tub within a predetermined temperature range, cause the ozone supply means to stop the supply of the ozone and turn on the ozone elimination means a predetermined period before an end of the deodorization operation period so as to eliminate the supplied ozone by the end of the deodorization operation period, supply a predetermined amount of water into the water supply passage to retain water in the water supply trap portion to form a water supply trap, and supply a predetermined amount of water directly into the drain port through the separate water passage (39, 41) to retain water in the drain trap portion to form a drain trap. form traps in the water supply trap portion and the drain trap portion based on an operation start signal, cause the ozone supply means to supply the ozone based on said operation start signal, cause the heating means to heat the air contained in the washing tub to maintain an inside air temperature of the washing tub within a predetermined temperature range, cause the ozone supply means to stop the supply of the ozone and turn on the ozone elimination means a predetermined period before an end of the deodorization operation period so as to eliminate the supplied ozone by the end of the deodorization operation period, supply a predetermined amount of water into the water supply passage to retain water in the water supply trap portion to form a water supply trap, and supply a predetermined amount of water directly into the drain port through the separate water passage (39, 41) to retain water in the drain trap portion to form a drain trap.