A convection apparatus comprising: a convection housing coupled to a rear wall of a cavity, a convection chamber being defined between the rear wall of the cavity and the convection housing, a convection heater (130,140) received in the convection chamber; at least two convection fans (110,120) blowing air heated by the convection heater (130,140) and received in the convection chamber; and one convection motor driving the at least two convection fans (110,120), and a power transmission unit transmitting power of the convection motor to the respective convection fans (110,120), wherein a partitioning member partitioning the convection chamber into two spaces side by side is formed in the convection housing, and the respective convection fans (110,120) are positioned in the partitioned spaces, characterized in that the at least two convection fans (110,120) include a first convection fan and a second convection fan, the power transmission unit includes: a first rotation member coupled to the convection motor; a second rotation member coupled to the first convection fan to receive power of the convection motor; a third rotation member coupled to the second convection fan to receive power of the convection motor, a first power transmission part transmitting power of the convection motor to the first convection fan and surrounded in the first rotation member and the second rotation member; and a second power transmission part transmitting power of the convection motor to the second convection fan and surrounded in the second rotation member and the third rotation member, wherein the rotation direction of at least one of the at least two convection fans (110,120) is opposite to the rotation direction of the convection motor. a convection housing coupled to a rear wall of a cavity, a convection chamber being defined between the rear wall of the cavity and the convection housing, a convection heater (130,140) received in the convection chamber; at least two convection fans (110,120) blowing air heated by the convection heater (130,140) and received in the convection chamber; and one convection motor driving the at least two convection fans (110,120), and a power transmission unit transmitting power of the convection motor to the respective convection fans (110,120), wherein a partitioning member partitioning the convection chamber into two spaces side by side is formed in the convection housing, and the respective convection fans (110,120) are positioned in the partitioned spaces, characterized in that the at least two convection fans (110,120) include a first convection fan and a second convection fan, the power transmission unit includes: a first rotation member coupled to the convection motor; a second rotation member coupled to the first convection fan to receive power of the convection motor; a third rotation member coupled to the second convection fan to receive power of the convection motor, a first power transmission part transmitting power of the convection motor to the first convection fan and surrounded in the first rotation member and the second rotation member; and a second power transmission part transmitting power of the convection motor to the second convection fan and surrounded in the second rotation member and the third rotation member, wherein the rotation direction of at least one of the at least two convection fans (110,120) is opposite to the rotation direction of the convection motor.