US Patent 10355469 Seal structure for multicore cable

A seal structure for a multicore cable includes a multicore cable in which a first electrical wire to a fourth electrical wire are enveloped by a sheath, a rubber plug that is fitted around an end portion of the sheath and has through-holes through which the electrical wires respectively pass, and a holder having a sheath holding portion configured to hold the sheath and suppress shifting of a position of the sheath relative to the multicore cable, in which the holder has locking portion portions configured to hold the rubber plug and suppress movement of the rubber plug in a direction in which the rubber plug comes off from the end portion of the sheath.