Importance

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Abstract

Provided is a component mount board having such a structure that a state of a component mount board being soaked in liquid can be more reliably sensed. A component mount board 100 includes a sheet-shaped moisture detection sensor 90. The moisture detection sensor 90 includes: a board 10 having a base 11, a first conductive pattern 30 formed on the base 11, and a mount component 50 electrically connected to the first conductive pattern 30; and a second conductive pattern 40 forming a circuit 60 together with the first conductive pattern 30 in a complementary manner. A portion of the base 11 corresponding to the second conductive pattern 40 is a missing portion 12. The component mount board 100 further includes a water-absorption expansion material 70. When expanding by water absorption, the water-absorption expansion material 70 presses the base 11 or the second conductive pattern 40 in a direction perpendicular to the plane of the base 11 to break the second conductive pattern 40.

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First Claim