A flexible printed board electrically connected to an electronic component (for example, a liquid crystal panel) by thermal compression bonding, including a flexible substrate, a terminal portion formed on one surface of the flexible substrate and having a plurality of connection terminals to be connected to the electronic component, a wire portion having a plurality of wires formed on the other surface of the flexible substrate, and a plurality of through wires formed inside through holes penetrating the flexible substrate in a compression bonding connection area to the electronic component of the terminal portion to connect the connection terminals of the terminal portion and the respective wires of the wire portion.