An ejection device (100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200) for being mounted on a flying object (30, 2130, 2230, 2330, 2430, 2530, 2630) comprising: a sliding member; a cylinder (14, 414, 514, 614, 814, 914, 1014, 3314) that accommodates the sliding member inside and includes a hole portion (13, 413, 513, 613, 813, 913, 1013, 3313) configured to allow the sliding member to project outward from the inside during operation; a push-up member (15, 415, 515, 615, 815, 915, 1015, 1715, 1815, 1915, 2015, 3015, 3115, 3215, 3315); an ejected object (16, 416, 1016, 1616, 3016, 3116, 3216, 3316, 4016, 4116) and a power source (17, 417, 517, 617, 817, 917, 1017, 3317) that moves the sliding member in the cylinder such that the sliding member projects outward from the inside, characterized in that the push-up member (15, 415, 515, 615, 815, 915, 1015, 1615, 1715, 1815, 1915, 2015, 3015, 3115, 3215, 3315) has a bottomed cylindrical portion (19, 219, 319, 419, 519, 619, 819, 919, 1019, 1119, 1219, 1319, 1419, 1519, 1619, 1719, 1819, 1919, 2019, 3019, 3119, 3219, 3319) disposed to cover at least a portion of the cylinder (14, 414, 514, 614, 814, 914, 1014, 3314) and a flange-like portion (20, 420, 520, 620, 820, 920, 1020, 1620, 3320) formed to project outward from an opening portion of the bottomed cylindrical portion (19, 219, 319, 419, 519, 619, 819, 919, 1019, 1119, 1219, 1319, 1419, 1519, 1619, 1719, 1819, 1919, 2019, 3019, 3119, 3219, 3319) or from an intermediate portion of a side surface of the bottomed cylindrical portion (19, 219, 319, 419, 519, 619, 819, 919, 1019, 1119, 1219, 1319, 1419, 1519, 1619, 1719, 1819, 1919, 2019, 3019, 3119, 3219, 3319) and wherein the push-up member (15, 415, 515, 615, 815, 915, 1015, 1615, 1715, 1815, 1915, 2015, 3015, 3115, 3215, 3315) is pushed up in one direction by the sliding member; and wherein the ejected object (16, 416, 1016, 1616, 3016, 3116, 3216, 3316, 4016, 4116) is pushed up while being supported by the flange-like portion of the push-up member(15, 415, 515, 615, 815, 915, 1015, 1615, 1715, 1815, 1915, 2015, 3015, 3115, 3215, 3315). a sliding member; a cylinder (14, 414, 514, 614, 814, 914, 1014, 3314) that accommodates the sliding member inside and includes a hole portion (13, 413, 513, 613, 813, 913, 1013, 3313) configured to allow the sliding member to project outward from the inside during operation; a push-up member (15, 415, 515, 615, 815, 915, 1015, 1715, 1815, 1915, 2015, 3015, 3115, 3215, 3315); an ejected object (16, 416, 1016, 1616, 3016, 3116, 3216, 3316, 4016, 4116) and a power source (17, 417, 517, 617, 817, 917, 1017, 3317) that moves the sliding member in the cylinder such that the sliding member projects outward from the inside, characterized in that the push-up member (15, 415, 515, 615, 815, 915, 1015, 1615, 1715, 1815, 1915, 2015, 3015, 3115, 3215, 3315) has a bottomed cylindrical portion (19, 219, 319, 419, 519, 619, 819, 919, 1019, 1119, 1219, 1319, 1419, 1519, 1619, 1719, 1819, 1919, 2019, 3019, 3119, 3219, 3319) disposed to cover at least a portion of the cylinder (14, 414, 514, 614, 814, 914, 1014, 3314) and a flange-like portion (20, 420, 520, 620, 820, 920, 1020, 1620, 3320) formed to project outward from an opening portion of the bottomed cylindrical portion (19, 219, 319, 419, 519, 619, 819, 919, 1019, 1119, 1219, 1319, 1419, 1519, 1619, 1719, 1819, 1919, 2019, 3019, 3119, 3219, 3319) or from an intermediate portion of a side surface of the bottomed cylindrical portion (19, 219, 319, 419, 519, 619, 819, 919, 1019, 1119, 1219, 1319, 1419, 1519, 1619, 1719, 1819, 1919, 2019, 3019, 3119, 3219, 3319) and wherein the push-up member (15, 415, 515, 615, 815, 915, 1015, 1615, 1715, 1815, 1915, 2015, 3015, 3115, 3215, 3315) is pushed up in one direction by the sliding member; and wherein the ejected object (16, 416, 1016, 1616, 3016, 3116, 3216, 3316, 4016, 4116) is pushed up while being supported by the flange-like portion of the push-up member(15, 415, 515, 615, 815, 915, 1015, 1615, 1715, 1815, 1915, 2015, 3015, 3115, 3215, 3315).