{HEAD ~ The conductive particle layer} includes {TAIL ~ conductive particles} containing acicular particles, the conductive particle layer has a three dimensional porous network structure, interconnection of the conductive particles forms the three dimensional network structure, the three dimensional network structure is joined to the first electrode, and the conductive particle layer contains pores having a pore size of 50 nm or more in a total volume of 50% or more based on the volume of all pores in the conductive particle layer 
{ HEAD ~ The conductive particle layer } includes { TAIL ~ conductive particles } containing acicular particles , the conductive particle layer has a three dimensional porous network structure , interconnection of the conductive particles forms the three dimensional network structure , the three dimensional network structure is joined to the first electrode , and the conductive particle layer contains pores having a pore size of 50 nm or more in a total volume of 50 % or more based on the volume of all pores in the conductive particle layer
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