Patent ID: 7713230

Claim:
A breast pump, comprising: a breast pump main body including a negative pressure generating member; a storage container configured to store milk, the container including an attachment/detachment portion configured to attach and detach the storage container to and from the breast pump main body; and an operator located adjacent the breast pump main body and configured to deform the negative pressure generating member of the breast pump main body, wherein the breast pump main body includes, an enlarged-diameter milking portion that increases in diameter toward a tip end configured to contact with a breast of a user, a small valve chamber configured to face the storage container and is in fluid communication with the enlarged-diameter milking portion, and an attachment portion in fluid communication with the small valve chamber and configured for attachment to the negative pressure generating member, the negative pressure generating member includes, a joint portion configured to be selectively joined to the operator by an engagement portion, the engagement portion formed by an enlarged diameter of a tip end side of an extension portion extending in rod form, an attachment/detachment portion molded from a comparatively flexible material and possessing elasticity, and the attachment/detachment portion configured to be attached to and detached from the attachment portion of the breast pump main body, a wall portion integrally formed with the attachment/detachment portion, and a deforming portion located on an inside of the wall portion, the deforming portion being thinner than the wall portion, and configured to deform upon reception of a force from the joint portion to thereby generate the negative pressure, the operator includes, a bearing portion rotatably supported on a spindle portion on the breast pump main body, an engaged portion that is disposed on one end of the operator and configured to be selectively joined to the joint portion, and a lever portion disposed an other end of the operator, the engaged portion includes an engagement opening located in the one end of the operator, and the engagement opening includes, an insertion opening portion located adjacent the bearing portion and being larger than an outer perimeter of the engagement portion, and a holding opening portion extending from the insertion opening portion and located closer to the tip end side of the joint portion than the insertion opening portion when the operator is operated, and is smaller than the outer perimeter of the engagement portion, and wherein the insertion opening portion is located between the holding opening portion and the lever portion.