Printed board

A printed board comprising:

• a main printed board;
• and
• a flexible printed board which is fixed to the main printed board;
• wherein the flexible printed board comprises:
• a box part which is formed in a box shape in which an opening facing the main printed board is defined;
• and
• a fixed part which is extended to an outer peripheral side of the box part and is fixed to the main printed board;
• the flexible printed board is formed with a plurality of tamper detection patterns;
• a tamper detection pattern of the plurality of tamper detection patterns is provided for detecting at least one of disconnection of the tamper detection pattern itself and a short circuit with other tamper detection pattern of the plurality of tamper detection patterns;
• an internal land which is one end part of the tamper detection pattern is electrically connected with the main printed board and is disposed on an inner side of the box part;
• an external land of a plurality of external lands is another end part of the tamper detection pattern, is formed in the fixed part and is fixed to and electrically connected with the main printed board;
• and
• the plurality of external lands is insulated from each other and each of the plurality of external lands is not electrically connected with other external lands of the plurality of external lands.