This invention provides a grain discharge apparatus, capable of more easily and quickly discharging grains in a grain discharge apparatus having a retractable transport cylinder. A retractable second transport cylinder (30) is provided with: an inner cylinder (32) connected to the terminal part (20b) of a first transport cylinder (20) and an outer cylinder (31) movably engaged with the inner cylinder (32) at a retraction direction, wherein the base part (32a) of the inner cylinder (32) is inserted in and fixed to the terminal part (20b) of the first transport cylinder (20). The inner diameter of the inner cylinder (32) is set to be less than the inner diameter of the first transport cylinder (20) and the inner diameter of the outer cylinder (31). The inner periphery of the base part (32a) of the inner cylinder (32) is formed with a conical part (35) which reduces the step difference relative to the inner circumference of the first transport cylinder (20).本發明提供一種穀粒排出裝置,在具有能夠伸縮的輸送筒的穀粒排出裝置中,能夠更容易且迅速地排出穀粒。在能夠伸縮的第二輸送筒(30)上具有:與第一輸送筒(20)的末端部(20b)連接的內側筒(32);以及在伸縮方向上移動自如地嵌合在該內側筒(32)的外周的外側筒(31),內側筒(32)的基端部(32a)被插入並固定於第一輸送筒(20)的末端部(20b),內側筒(32)的內徑被設定為比第一輸送筒(20)的內徑以及外側筒(31)的內徑小,在內側筒(32)的基端部(32a)的內周面上形成有錐部(35),該錐部(35)減小與第一輸送筒(20)的內周面之間的階梯差。20‧‧‧第一輸送筒20b‧‧‧另一端部(末端部)30‧‧‧第二輸送筒30a‧‧‧一端部30b‧‧‧另一端部31‧‧‧外側筒31b‧‧‧另一端部(末端部)32‧‧‧內側筒32a‧‧‧一端部(基端部)70‧‧‧排出裝置71‧‧‧排出口
