A lubrication device (LS) for a helicopter including: an oil sump (6) in which oil (OL) for lubrication is retained; a lubrication pump (8) configured to suck the oil (OL) from the oil sump (6) to discharge the oil; and a lubrication passage (10) extending from the lubrication pump (8) to a first lubrication target (12). The lubrication passage (10) includes: a first supply port (22) that supplies the oil (OL) to the first lubrication target (22); an oil reservoir (26) provided upstream of the first supply port (22); and an opening (28) provided upstream of the oil reservoir (26) and above the oil reservoir (26). The first supply port (22) is formed right above the first lubrication target (12).