A container with a lid comprising: a container portion having an opening portion for loading and unloading a content; a lid portion that can be detachably fitted in said opening portion so as to close the same; and a lever mechanism portion (30, 40, 50, 60) for opening said lid portion when said opening portion is closed thereby, using leverage: characterized in that said lever mechanism portion (30, 40, 50, 60) is composed of a lever portion (33, 43, 53, 63) having a force-applied point portion where finger pressure is applied and an action point portion that is pressed against a periphery portion of said lid portion so as to open said lid portion, and a support portion (30A, 44, 50A, 61) that supports said lever portion (33, 43, 53, 63) via a fulcrum portion in a freely swinging manner; said lever portion (33, 43, 53, 63) and said support portion (30A, 44, 50A, 61) of said lever mechanism portion (30, 40, 50, 60) are continuous via a thin-walled portion (35, 45, 65) that is flexible and that constitutes said fulcrum portion; and said support portion (30A, 44, 50A, 61) of said lever mechanism portion (30, 40, 50, 60) includes a pair of left and right support piece portions (31, 32, 51, 52, 61a) protruding, with a predetermined interval provided therebetween, in a direction along the plane of the opening of said container portion, wherein said lever portion (33, 43, 53, 63) is disposed between said pair of support piece portions (31, 32, 51, 52, 61a), and wherein said pair of support piece portions (31, 32, 51, 52, 61a) is connected to a force-applied-point side portion of said lever portion (33, 43, 53, 63) via a thin-walled portion (35, 45, 65) that constitutes said fulcrum portion. a container portion having an opening portion for loading and unloading a content; a lid portion that can be detachably fitted in said opening portion so as to close the same; and a lever mechanism portion (30, 40, 50, 60) for opening said lid portion when said opening portion is closed thereby, using leverage: characterized in that said lever mechanism portion (30, 40, 50, 60) is composed of a lever portion (33, 43, 53, 63) having a force-applied point portion where finger pressure is applied and an action point portion that is pressed against a periphery portion of said lid portion so as to open said lid portion, and a support portion (30A, 44, 50A, 61) that supports said lever portion (33, 43, 53, 63) via a fulcrum portion in a freely swinging manner; said lever portion (33, 43, 53, 63) and said support portion (30A, 44, 50A, 61) of said lever mechanism portion (30, 40, 50, 60) are continuous via a thin-walled portion (35, 45, 65) that is flexible and that constitutes said fulcrum portion; and said support portion (30A, 44, 50A, 61) of said lever mechanism portion (30, 40, 50, 60) includes a pair of left and right support piece portions (31, 32, 51, 52, 61a) protruding, with a predetermined interval provided therebetween, in a direction along the plane of the opening of said container portion, wherein said lever portion (33, 43, 53, 63) is disposed between said pair of support piece portions (31, 32, 51, 52, 61a), and wherein said pair of support piece portions (31, 32, 51, 52, 61a) is connected to a force-applied-point side portion of said lever portion (33, 43, 53, 63) via a thin-walled portion (35, 45, 65) that constitutes said fulcrum portion. characterized in that said lever mechanism portion (30, 40, 50, 60) is composed of a lever portion (33, 43, 53, 63) having a force-applied point portion where finger pressure is applied and an action point portion that is pressed against a periphery portion of said lid portion so as to open said lid portion, and a support portion (30A, 44, 50A, 61) that supports said lever portion (33, 43, 53, 63) via a fulcrum portion in a freely swinging manner; said lever portion (33, 43, 53, 63) and said support portion (30A, 44, 50A, 61) of said lever mechanism portion (30, 40, 50, 60) are continuous via a thin-walled portion (35, 45, 65) that is flexible and that constitutes said fulcrum portion; and said support portion (30A, 44, 50A, 61) of said lever mechanism portion (30, 40, 50, 60) includes a pair of left and right support piece portions (31, 32, 51, 52, 61a) protruding, with a predetermined interval provided therebetween, in a direction along the plane of the opening of said container portion, wherein said lever portion (33, 43, 53, 63) is disposed between said pair of support piece portions (31, 32, 51, 52, 61a), and wherein said pair of support piece portions (31, 32, 51, 52, 61a) is connected to a force-applied-point side portion of said lever portion (33, 43, 53, 63) via a thin-walled portion (35, 45, 65) that constitutes said fulcrum portion.