A lubrication device for a helicopter comprising: an oil sump in which oil for lubrication is retained; a lubrication pump configured to suck the oil from the oil sump to discharge the oil; and a lubrication passage extending from the lubrication pump to a first lubrication target, wherein the lubrication passage includes: a first supply port configured to supply the oil within the lubrication passage to the first lubrication target, wherein the first supply port permits the oil from within the lubrication passage to reach the first lubrication target: under the influence of gravity, by oil dripping under gravity from the first supply port onto the first lubrication target when hydraulic pressure in the lubrication passage is decreased to a pressure in the oil sump, or under oil pressure when hydraulic pressure in the lubrication passage is higher than the pressure in the oil sump; an oil reservoir provided upstream of the first supply port with respect to a flow direction of the oil; an opening provided upstream of an outlet of the oil reservoir and above the outlet of the oil reservoir; characterised in that the lubrication device comprises: a second supply port provided upstream of the oil reservoir and configured to supply the oil in the lubrication passage to a second lubrication target. an oil sump in which oil for lubrication is retained; a lubrication pump configured to suck the oil from the oil sump to discharge the oil; and a lubrication passage extending from the lubrication pump to a first lubrication target, wherein the lubrication passage includes: a first supply port configured to supply the oil within the lubrication passage to the first lubrication target, wherein the first supply port permits the oil from within the lubrication passage to reach the first lubrication target: under the influence of gravity, by oil dripping under gravity from the first supply port onto the first lubrication target when hydraulic pressure in the lubrication passage is decreased to a pressure in the oil sump, or under oil pressure when hydraulic pressure in the lubrication passage is higher than the pressure in the oil sump; an oil reservoir provided upstream of the first supply port with respect to a flow direction of the oil; an opening provided upstream of an outlet of the oil reservoir and above the outlet of the oil reservoir; a first supply port configured to supply the oil within the lubrication passage to the first lubrication target, wherein the first supply port permits the oil from within the lubrication passage to reach the first lubrication target: under the influence of gravity, by oil dripping under gravity from the first supply port onto the first lubrication target when hydraulic pressure in the lubrication passage is decreased to a pressure in the oil sump, or under oil pressure when hydraulic pressure in the lubrication passage is higher than the pressure in the oil sump; under the influence of gravity, by oil dripping under gravity from the first supply port onto the first lubrication target when hydraulic pressure in the lubrication passage is decreased to a pressure in the oil sump, or under oil pressure when hydraulic pressure in the lubrication passage is higher than the pressure in the oil sump; an oil reservoir provided upstream of the first supply port with respect to a flow direction of the oil; an opening provided upstream of an outlet of the oil reservoir and above the outlet of the oil reservoir;