Extensible and contractible mounting board

An extensible and contractible mounting board comprising:

• an extensible and contractible substrate;
• an extensible and contractible wiring line on one main surface of the extensible and contractible substrate;
• an electronic component electrically connected to the extensible and contractible wiring line;
• and
• a resin portion in contact with the extensible and contractible wiring line on a side thereof that is opposite to the extensible and contractable substrate in a plan view of the extensible and contractable mounting board, the resin portion covering the electronic component on a side thereof that is opposite to the extensible and contractible substrate in the plan view of the extensible and contractable mounting board, and the resin portion overlapping an end portion of a connection region between the extensible and contractible wiring line and the electronic component in the plan view of the extensible and contractible mounting board, the resin portion having a cutout portion that overlaps the extensible and contractible wiring line,
• wherein a Young's modulus of the resin portion is higher than a Young's modulus of the extensible and contractible substrate.