A sample injection device for flow-type analysis configured to inject a sample into a carrier-liquid channel, the device comprising: a cylindrical needle which extends in a vertical direction and penetrates through an upper wall and a lower wall at a sample injection position of the carrier-liquid channel; ring-like sealing members (25,26) that seal the penetrated portions; a vessel holding portion arranged below the lower wall and which holds a vessel in which a sample is contained; a needle moving unit capable of causing the needle to move in a vertical direction; a measurement pump which can be connected with the needle on an upper end of the needle; a washing liquid feeding device; and a washing liquid recovery device, wherein the cylindrical needle includes an inner hole which is closed on a side of the lower end thereof and open on an outer peripheral surface as a horizontal hole, wherein the needle moving unit is capable of causing the needle to move in the vertical direction to at least a sample drawing position at which the horizontal hole is positioned below the lower wall and faces an inside of the vessel a sample injection position at which the horizontal hole is positioned above the lower wall and faces the carrier-liquid channel and wherein a washing position is set at a position between the sample drawing position and the sample injection position outside the carrier-liquid channel as a position for the needle to move by being induced by the needle moving unit, wherein the measurement pump is connected to the cylindrical needle on the upper end of the needle and configured to perform a drawing operation when the needle is positioned at the sample drawing position and a discharge operation when the needle is positioned at the sample injection position, wherein the washing liquid feeding device is capable of feeding washing liquid from a washing liquid tank to an inside of the needle to discharge the washing liquid through the horizontal hole when the needle is positioned at the washing position, and wherein the washing liquid recovery device is configured to recover the washing liquid which flows out through the horizontal hole when the needle is positioned at the washing position by surrounding the needle. a cylindrical needle which extends in a vertical direction and penetrates through an upper wall and a lower wall at a sample injection position of the carrier-liquid channel; ring-like sealing members (25,26) that seal the penetrated portions; a vessel holding portion arranged below the lower wall and which holds a vessel in which a sample is contained; a needle moving unit capable of causing the needle to move in a vertical direction; a measurement pump which can be connected with the needle on an upper end of the needle; a washing liquid feeding device; and a washing liquid recovery device, wherein the cylindrical needle includes an inner hole which is closed on a side of the lower end thereof and open on an outer peripheral surface as a horizontal hole, wherein the needle moving unit is capable of causing the needle to move in the vertical direction to at least a sample drawing position at which the horizontal hole is positioned below the lower wall and faces an inside of the vessel a sample injection position at which the horizontal hole is positioned above the lower wall and faces the carrier-liquid channel and wherein a washing position is set at a position between the sample drawing position and the sample injection position outside the carrier-liquid channel as a position for the needle to move by being induced by the needle moving unit, wherein the measurement pump is connected to the cylindrical needle on the upper end of the needle and configured to perform a drawing operation when the needle is positioned at the sample drawing position and a discharge operation when the needle is positioned at the sample injection position, wherein the washing liquid feeding device is capable of feeding washing liquid from a washing liquid tank to an inside of the needle to discharge the washing liquid through the horizontal hole when the needle is positioned at the washing position, and wherein the washing liquid recovery device is configured to recover the washing liquid which flows out through the horizontal hole when the needle is positioned at the washing position by surrounding the needle.