To provide a moving image transmission device and a moving image transmission method capable of transmitting a high-quality moving image via a network even in a state where a broad band cannot be obtained as with an IP camera.　Provided is a transmission device 1 which is connected with an image pickup device 3 directly or via a network and transmits a moving image to a receiving terminal 6 via a network 4, the image pickup device 3 including an image pickup unit 31 configured to pick up a moving image, an encoding unit 32 configured to perform encode processing to a picked-up moving image so as to generate the first stream data, and an output unit 33 configured to output the generated first stream data, the transmission device 1 including: a receiving unit 11 configured to receive the first stream data from the image pickup device 3; a storage unit 12 configured to store the received or generated stream data; a processing unit 13 configured to perform re-encode processing to the first stream data stored in the storage unit 12 so as to generate the compressed second stream data; and a transmitting unit 14 configured to transmit the second stream data.