A time indicator, comprising: a plate-shaped base configured to have a predetermined area; a chamber provided on one side of the base, and configured to have an inner filling space and allow the filling space to be filled with ink; and strips formed inside the base, and configured to extend to predetermined lengths; wherein front ends of the strips are connected to the chamber; wherein the chamber are configured such that the chamber has rupturable portions which are ruptured when external force is applied to the chamber and such that the ink inside the chamber flows into the strips through the rupturable portions when the rupturable portions are ruptured; wherein the base has a window which is formed over the strips and has optical transparency such that the ink having flowed into the strips is visible from an outside; wherein the chamber comprises: a chamber body formed in a predetermined three-dimensional shape, made of a material deformable by external force, and configured to have the filling space therein; and a partition configured to separate the filling space inside the chamber body into a first filling space and a second filling space; wherein the first filling space and the second filling space form a first chamber and a second chamber, respectively, and the first chamber and the second chamber are formed in an integrated manner inside the single chamber body; wherein the rupturable portions comprise a first rupturable portion formed on a bottom of the first chamber and a second rupturable portion formed on a bottom of the second chamber, and said first and second rupturable portions being configured to rupture simultaneously, when an external pressure is applied to the chamber, thus causing the first and second chamber to be simultaneously operated; wherein the strips comprise a first strip and a second strip, and the first strip is connected to the first chamber and the second strip is connected to the second chamber; wherein the first strip is disposed over the second strip to overlap each other in a vertical direction; and wherein the second strip has a longer length than the first strip, and the second strip extends longer than the first strip by a predetermined length. a plate-shaped base configured to have a predetermined area; a chamber provided on one side of the base, and configured to have an inner filling space and allow the filling space to be filled with ink; and strips formed inside the base, and configured to extend to predetermined lengths; wherein front ends of the strips are connected to the chamber; wherein the chamber are configured such that the chamber has rupturable portions which are ruptured when external force is applied to the chamber and such that the ink inside the chamber flows into the strips through the rupturable portions when the rupturable portions are ruptured; wherein the base has a window which is formed over the strips and has optical transparency such that the ink having flowed into the strips is visible from an outside; wherein the chamber comprises: a chamber body formed in a predetermined three-dimensional shape, made of a material deformable by external force, and configured to have the filling space therein; and a partition configured to separate the filling space inside the chamber body into a first filling space and a second filling space; a chamber body formed in a predetermined three-dimensional shape, made of a material deformable by external force, and configured to have the filling space therein; and a partition configured to separate the filling space inside the chamber body into a first filling space and a second filling space; wherein the first filling space and the second filling space form a first chamber and a second chamber, respectively, and the first chamber and the second chamber are formed in an integrated manner inside the single chamber body; wherein the rupturable portions comprise a first rupturable portion formed on a bottom of the first chamber and a second rupturable portion formed on a bottom of the second chamber, and said first and second rupturable portions being configured to rupture simultaneously, when an external pressure is applied to the chamber, thus causing the first and second chamber to be simultaneously operated; wherein the strips comprise a first strip and a second strip, and the first strip is connected to the first chamber and the second strip is connected to the second chamber; wherein the first strip is disposed over the second strip to overlap each other in a vertical direction; and wherein the second strip has a longer length than the first strip, and the second strip extends longer than the first strip by a predetermined length.