A processing apparatus includes a processing container, a main body constituting a lower portion of the processing container, and a lid constituting an upper portion of the processing container, wherein the lid includes a shower plate, a plate portion provided above the shower plate, and a connecting member for connecting the shower plate to the plate portion, a guide groove arranged to face the shower plate is provided in a lower surface of the plate portion, a protruding portion of the connecting member is accommodated in the guide groove, a position of the shower plate with respect to the plate portion is determined by accommodating the protruding portion in a first end of the guide groove, and in a state in which the protruding portion is accommodated in the first end and the lid is separated from the main body, the shower plate is suspended from the plate portion.