A modular connection board , which is configured to be attached to a group of electricity storage elements each including electrode terminals, the modular connection board comprising: at least two connection board modules , each of the at least two connection board modules comprising: a bracket including a plurality of connection member mounting portions , which are arranged to form a first row along one of a pair of first side edges of the connection board module , and to form a second row along the other one of the pair of first side edges of the connection board module , wherein the pair of first side edges of the connection board module extends in a first direction ; a plurality of connection members , which are mounted in the plurality of connection member mounting portions , for connecting the electrode terminals of adjacent electricity storage elements to each other; and a circuit board supporting portion , which is arranged on the bracket and configured to receive a circuit board , wherein at least one holding element is arranged in the circuit board supporting portion, which is configured to hold the circuit board by a press-fit connection; wherein between each two adjacent connection board modules an interface is provided, which extends in a second direction different from the first direction , and which comprises at least one joint for joining the two adjacent connection board modules with each other. at least two connection board modules , each of the at least two connection board modules comprising: a bracket including a plurality of connection member mounting portions , which are arranged to form a first row along one of a pair of first side edges of the connection board module , and to form a second row along the other one of the pair of first side edges of the connection board module , wherein the pair of first side edges of the connection board module extends in a first direction ; a plurality of connection members , which are mounted in the plurality of connection member mounting portions , for connecting the electrode terminals of adjacent electricity storage elements to each other; and a circuit board supporting portion , which is arranged on the bracket and configured to receive a circuit board , wherein at least one holding element is arranged in the circuit board supporting portion, which is configured to hold the circuit board by a press-fit connection; a bracket including a plurality of connection member mounting portions , which are arranged to form a first row along one of a pair of first side edges of the connection board module , and to form a second row along the other one of the pair of first side edges of the connection board module , wherein the pair of first side edges of the connection board module extends in a first direction ; a plurality of connection members , which are mounted in the plurality of connection member mounting portions , for connecting the electrode terminals of adjacent electricity storage elements to each other; and a circuit board supporting portion , which is arranged on the bracket and configured to receive a circuit board , wherein at least one holding element is arranged in the circuit board supporting portion, which is configured to hold the circuit board by a press-fit connection; wherein between each two adjacent connection board modules an interface is provided, which extends in a second direction different from the first direction , and which comprises at least one joint for joining the two adjacent connection board modules with each other. <EOS>