The invention provides a battery block and a secondary battery module. The purpose of the present invention is to obtain a battery block that can alleviate stress acting on a connecting portion due to thermal expansion and contraction and dimensional differences. This battery block (40) comprises a plurality of conducting members (191) that are arrayed along a side surface (114) of a retaining case (111) and electrically connect corresponding battery cells (101) to each other; voltage detection substrates (201, 202) that are disposed to face the side surface (114) of the retaining case (111) and detect the voltage of the battery cells (101); and a plurality of voltage detection terminals (204) that are disposed on the voltage detection substrates (201, 202) and are electrically connected to a plurality of conducting members (192) respectively. In each of the voltage detection terminals (204), a fixed section (221) that is fixed to the voltage detection substrates (201, 202) and a connected section (231) that is connected to the conducting members (192) are disposed in the direction of arrangement, and a curved section (241) that can be elastically deformed in at least the direction of arrangement is provided between the fixed section (221) and the connected section (231).