Cell stack device, module, and module-containing device

A cell stack device comprising:

• a plurality of cells having a columnar shape;
• and
• an electrically conductive member interposed between adjacent cells of the plurality of cells and connected to each of the respective adjacent cells with a bonding material having electrically conductive property,
• wherein
• the bonding material contains electrically conductive particles and fibrous bodies having electrically insulating property, and
• a major axis direction of the fibrous bodies is oriented in a predetermined direction in regions where the electrically conductive members face each of the respective adjacent cells, wherein
• the major axis direction of the fibrous bodies is oriened in a longitudinal direction of the plurality of cells and
• in a cross-section of the bonding material perpendicular to a lateral direction of the plurality of cells, a percentage of the fibrous bodies, whose major axis directions are oriented in the longitudinal direction of the plurality of cells, is no greater than 30%.