A blower type chemical diffusing apparatus is small in thickness, simple in structure and reduced in cost structurally. This apparatus allows the chemical and battery to be exchanged readily and to facilitate electrically connecting battery to the motor in the blower. The apparatus casing comprises a first and a second side casing counterpart hinged together to allow its opening and closure. The apparatus also includes a blower with a motor and fan mounted in the first casing body. A chemical cartridge is disposed between the blower and the second casing body. The cartridge contains a chemical impregnated body that comprises a carrier in the form of a sheet impregnated with chemical. Also provided in the first casing body is a battery accommodating recess in which dry cells may removably be accepted to drive the motor and thereby to rotate the fan. Air is thus forced to flow through the chemical cartridge.