Laminated board for testing electronic components

An electronic component testing laminated board suitable for performing a heat test on electronic compo nents of a multikind and small quantity production type. The laminated board includes a metal plate 101, a testing circuit layer 102 including a double-side printed wiring board 102a or the like and integrally formed through a thin electric insulating layer 104 on one side of the metal plate 101 for mounting thereon electronic components to be tested, and a heater circuit layer 103 including a metal foil circuit 103a or the like and integrally formed through another electric insulating layer 105 on the other side of the metal plate 101 for maintaining the testing circuit layer 102 at a given temperature. An inorganic filler or the like is added to the electric insulating layers 104,105. An electronic component testing box 1,2 for removably accommodating the electronic component testing laminated board 30 includes walls 1,2,3,4 made of a heat insulating material, power supply connecting connector, 8 signal input and output connector, 11 temperature measuring apparatus, 10 etc.