A high thermal expansion member consisting substantially of Fe—Ni—Cr based alloy, a low thermal expansion member consisting substantially of an Fe—Ni based alloy, and an intermediary member, which comprises one kind of metal selected from Fe, Al and Cu or an alloy comprising these metals, possesses a thermal expansion coefficient &agr;3 which has a value between those of the high thermal expansion member (thermal expansion coefficient &agr;1) and the low thermal expansion member (thermal expansion coefficient &agr;2) (&agr;1>&agr;3>&agr;2), and is interposed therebetween, are laminated to form a thermal deformation member for an electron tube or a thermal deformation member for electric control. The intermediary member, without adversely affecting strength or long term reliability of the thermal deformation member, contributes to manufacturing cost reductions and improvement of workability. In a color picture tube, the above described thermal deformation member for an electron tube is employed in a thermal deformation portion of a frame holder, one edge of which is solidly stuck to a panel and the other edge thereof being solidly stuck to a mask frame of a shadow mask. In an overcurrent protection, the above described thermal deformation member for electric current control is employed in a thermal deformation portion which opens a contact point.