A structure covering a connection line, an electric cooking appliance including the same, and a method of assembling a cap of the electric cooking appliance includes a base plate including a through hole in a vertical direction, a cap provided below the base plate and provided with an accommodation space formed therein to accommodate a connection line placed through the through hole from an upper portion of the base plate, a coupling boss extending in a vertical direction in the cap and coupled to bottom of the base plate to couple the cap to the base plate, and a fastener inserted through the base plate from the upper portion of the base plate to couple the base plate to the coupling boss.