Provided is an electrical connection box that achieves downsizing by means of efficient arrangement of electronic components and terminals on a board. An electrical connection box (1) includes a board (21), a terminal holder (22), flat-plate terminals (23), and electronic components (24). The terminal holder (22) is mounted to the board (21). The flat-plate terminal (23) includes a first portion (41), a second portion (42), and a third portion (43). The first portion (41) is connected to the board (21), and extends substantially perpendicularly from the board (21). The second portion (42) is connected to the first portion (41), and extends substantially in parallel with the board (21). The third portion (43) is connected to the second portion (42), is connectable to a connector, and extends substantially perpendicularly to the board (21). The electronic component (24) is arranged between the second portion (42) of the flat-plate terminal (23) and the board (21).