[Problem] To provide an oral cleaning device which employs a small and low-cost electric air pump with a low output and which is capable of securing enough delivery pressure for a cleaning liquid. [Solution] An oral cleaning device comprises: a cleaning liquid tank (2) which stores a cleaning liquid and can be closed in an air-tight manner； a cleaning liquid supply passage (24) which is provided with a delivery port (4a) for delivering the cleaning liquid into the mouth on one end and an introduction port (23a) which opens to the bottom of the cleaning liquid tank (2) on the other end； and an electric air pump (44) which supplies air to the inside of the cleaning liquid tank (2) and pressurizes the inside of the cleaning liquid tank (2). This device supplies the cleaning liquid inside the cleaning liquid tank (2) to the delivery port (4a) through the cleaning liquid supply passage (24) by air pressure inside the cleaning liquid tank (2). An air introduction hole (71) that opens on a middle part of the cleaning liquid supply passage (24) is provided, and a portion of the air that is supplied from the air pump (44) to the cleaning liquid tank (2) is supplied to the cleaning liquid supply passage (24) through the air introduction hole (71) and the cleaning liquid is delivered in a pulsatile manner from the delivery port (4a).
