configured such that on the metal foil 120 the first film 111 is formed on a first metal principal surface 121 facing upward in fig2 and 12 the second film 112 is formed on a second metal principal surface 122 facing downward in fig2 and 12 and further the third film 113 is formed on the second film 112 as shown in the sectional view fig2 of the film formed body 101 the width a lateral direction in fig2 of the second film 112 is larger than the width of the first film 111 accordingly the entire first film 111 is also an overlapping portion lw overlapping with the second film 112 when viewed in a thickness direction dt of the metal foil 120 it is to be noted that when the above strip shaped film formed body 101 is cut into pieces in the longitudinal direction and the pieces are laminated in the thickness direction dt this laminated body can constitute a power generating element bp of a bipolar secondary battery as shown in fig4 as with the first embodiment the first film 111 the second film 112 and the third film 113 of the film formed body 101 are formed by the aerosol deposition method using a third film forming device 240 mentioned later a method for manufacturing the film formed body 101 in the second embodiment will be explained below referring to the drawings fig1 is a schematic view of the third film forming device 240 this third film forming device 240 includes a film forming chamber 241 a first aerosol generator 248 a second aerosol generator 258 a third aerosol generator 268 a first regulator 249 a second regulator 259 a third regulator 269 three.