A burner includes: an adaptor to which a fuel supply box for supplying fuel is connected, and having a fuel inlet; a combustion part configured to perform combustion while fuel injected from the fuel inlet is discharged through a flow path; a connection housing disposed between the adaptor and the combustion part, having a fuel supply path communicated with the fuel inlet, and configured to feed fuel of the fuel supply box to the combustion part; an inflow fuel control part provided at one side of the connection housing, and configured to control the amount of fuel injected by controlling an open degree of the fuel inlet; and a feed fuel control part provided at another side of the connection housing, and configured to control the amount of fuel supplied to the combustion part by controlling an open degree of one side of the fuel supply path.