PROBLEM TO BE SOLVED: To provide an ear cover with a hearing aid function that is adaptable to a difference in outer ear size from one individual to another and capable of coping with senile hearing difficulty without consuming electric energy.SOLUTION: An ear cover with a hearing aid function having an L-shaped section intended to cover the area from the helix in the upper part of the auricle to the earlobe comprises an inner wall 13 formed in a C shape and an outer circumferential wall 12 formed in the thickness of the C shape continuous from the inner wall 13, and further has a fitting capacity part 10 with an elastic part 15 to hold the area down to the earlobe underneath the inner wall 13, a covering part 14 formed by closing one face of the fitting capacity part 10 and an open part 20 to let in sounds by opening the front portion of the fitting capacity part 10. A resonant space is formed of the auricle and the fitting capacity part 10, and the amplitude of a specific frequency range reaching the auricle is expanded by varying the square measures of the fitting capacity part 10 and of the open part 20.
