The present invention relates to a breast pump. The breast pump comprises a main body (21), a breast receiving funnel (23) extending from the main body (21), and a nipple receiving chamber (34) formed in the main body (21) to receive a user's nipple. The funnel (23) and the main body (21) are configured so that at least a portion of a user's nipple is received in the nipple receiving chamber (34) when a user's breast is disposed in the breast receiving funnel (23).