[Object]To provide a flexible printed board improved in bendability.[Means for solving]The flexible printed board 2 comprises: an insulating substrate 21; a circuit wiring 22 laid on the insulating substrate 21; a circuit protection layer 23 laid on the circuit wiring 22; a shield conductive layer 24 laid on the circuit protection layer 23; and a shield insulating layer 25 laid on the shield conductive layer 24, and is characterized by meeting the following Expression (1). 0.75≦E2/E1≦1.29  Expression (1) Note that E1 denotes the tensile elastic modulus of the shield conductive layer 24 and E2 denotes the tensile elastic modulus of the shield insulating layer 25.