To provide a terminal block and a terminal block system which have a plurality of insertion ports into which wires can be inserted, can facilitate insertion work for insertion into the insertion ports, and, when a plurality of wires have been inserted, can suppress interference between wires.SOLUTION: A terminal block 1 includes a housing 10 that has a plurality of insertion ports 100, and a holding member 11 that holds terminals having been inserted into the insertion ports 100. The plurality of insertion ports 100 are arranged to be alternately staggered along two parallel virtual straight lines over the same surface of the housing 10. For each insertion port 100, the housing 10 also has an auxiliary port 102 into which a tool for releasing the hold of the holding member 11 can be inserted.SELECTED DRAWING: Figure 1