The subject of the present invention is an inflation device (100) that can be used for inflating an inflatable craft (2) comprising two lateral tubes (3, 4) and a bottom (5) each comprising an independent air chamber (31, 41, 51), the said device (100) being characterized in that it comprises an airtight body (6) comprising an enclosure (7) having at least three communicating openings (11, 12, 13), each of the openings (11, 12, 13) being connected to another opening (11, 12, 13) by a passage that allows a stream of air to flow, and notably a first opening (11) intended to be connected to a first air-conveying means (32) intended to supply air to the air chamber (31) of the first lateral tube (3) of the inflatable craft (2), a second opening (12) intended to be connected to a second air-conveying means (42) intended to supply air to the air chamber (41) of the second lateral tube (4) of the inflatable craft (2), and a third opening (13) intended to be connected to an inflation pump.