The conductive particle layer includes 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 {TAIL ~ a total volume} of {HEAD ~ 50%} or more based on the volume of all pores in the conductive particle layer 
The conductive particle layer includes 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 { TAIL ~ a total volume } of { HEAD ~ 50 % } or more based on the volume of all pores in the conductive particle layer
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