of the board 1 fig2 a and 2b illustrate a printed wiring board in accordance with the second embodiment the illustrated printed wiring board is comprised of a board 1 having an upper surface 1 a and a lower surface 1 b a resin layer 2 formed on the lower surface 1 b of the board 1 electric parts 3 4 3 5 and 3 6 mounted on the lower surface 1 b of the board 1 in right half thereof and a push type switch 4 having an exposed contact formed on the upper surface 1 a of the board 1 the board 1 and the resin layer 2 are formed therethrough with through holes 5 through which a bolt not illustrated is inserted contrary to the first embodiment illustrated in fig1 the electric parts 3 4 3 5 and 3 6 are covered with the resin layer 2 in the second embodiment the resin layer 2 may be formed by transfer molding since leads not illustrated extending between the electric parts 3 4 3 5 and 3 6 and the board 1 for electrically connecting them to each other are fixed in the resin layer 2 a circuit including such leads is well protected from oscillation and or impact in transfer molding simplified molds may be used in dependence on the number of products to be fabricated since the lower surface 1 b of the board 1 is reinforced it would be possible to enhance operability of the push type switch 4 mounted on the upper surface 1 a in accordance with transfer molding if the electric part 3 4 for instance is comprised of.