A toner container (3, 3K) for an image forming apparatus, comprising: a container main body elongated in a longitudinal direction; a first toner storage portion configured to store toner in an inside thereof, and provided in one side of the container main body in the longitudinal direction of the container main body; a second toner storage portion configured to store toner in an inside thereof, and provided in the other side of the container main body in the longitudinal direction; and a gripping portion (122, 132) provided between the first toner storage portion and the second toner storage portion and including a concave portion (123,133,134) which is formed in a side portion of the container main body on one side in a width direction of the container main body, the width direction being one of two directions perpendicular to the longitudinal direction, wherein the toner container (3,3K) is configured to be attached to an attachment portion included in an image forming apparatus in a state where the longitudinal direction matches a vertical direction, i.e. an up-down direction, the first toner storage portion stores unused toner in an inside thereof, and is provided in an upper part of the container main body in an attachment attitude of the toner container (3,3K) attached to the attachment portion, the second toner storage portion stores, in an inside thereof, used toner collected from the image forming apparatus, and is provided in a lower part of the container main body, below the first toner storage portion in the attachment attitude, and the toner container (3,3K) further comprises: a cylindrical first conveyance guide portion provided on the first toner storage portion so as to project from a wall surface of the first toner storage portion on a side of the attachment portion toward the attachment portion, and configured to guide the unused toner stored in the first toner storage portion to a developing device included in the image forming apparatus; and a cylindrical second conveyance guide portion provided on the second toner storage portion so as to project from a wall surface of the second toner storage portion on a side of the attachment portion toward the attachment portion, and configured to receive the used toner collected from a drum unit included in the image forming apparatus and guide the used toner to the inside of the second toner storage portion. a container main body elongated in a longitudinal direction; a first toner storage portion configured to store toner in an inside thereof, and provided in one side of the container main body in the longitudinal direction of the container main body; a second toner storage portion configured to store toner in an inside thereof, and provided in the other side of the container main body in the longitudinal direction; and a gripping portion (122, 132) provided between the first toner storage portion and the second toner storage portion and including a concave portion (123,133,134) which is formed in a side portion of the container main body on one side in a width direction of the container main body, the width direction being one of two directions perpendicular to the longitudinal direction, wherein the toner container (3,3K) is configured to be attached to an attachment portion included in an image forming apparatus in a state where the longitudinal direction matches a vertical direction, i.e. an up-down direction, the first toner storage portion stores unused toner in an inside thereof, and is provided in an upper part of the container main body in an attachment attitude of the toner container (3,3K) attached to the attachment portion, the second toner storage portion stores, in an inside thereof, used toner collected from the image forming apparatus, and is provided in a lower part of the container main body, below the first toner storage portion in the attachment attitude, and the toner container (3,3K) further comprises: a cylindrical first conveyance guide portion provided on the first toner storage portion so as to project from a wall surface of the first toner storage portion on a side of the attachment portion toward the attachment portion, and configured to guide the unused toner stored in the first toner storage portion to a developing device included in the image forming apparatus; and a cylindrical second conveyance guide portion provided on the second toner storage portion so as to project from a wall surface of the second toner storage portion on a side of the attachment portion toward the attachment portion, and configured to receive the used toner collected from a drum unit included in the image forming apparatus and guide the used toner to the inside of the second toner storage portion. a cylindrical first conveyance guide portion provided on the first toner storage portion so as to project from a wall surface of the first toner storage portion on a side of the attachment portion toward the attachment portion, and configured to guide the unused toner stored in the first toner storage portion to a developing device included in the image forming apparatus; and a cylindrical second conveyance guide portion provided on the second toner storage portion so as to project from a wall surface of the second toner storage portion on a side of the attachment portion toward the attachment portion, and configured to receive the used toner collected from a drum unit included in the image forming apparatus and guide the used toner to the inside of the second toner storage portion.