An indentation testing instrument comprising: a loading lever supported pivotally; an indenter provided on a lower surface of one end side of the loading lever; an indenter linkage section provided on an upper surface of the one end side of the loading lever, which indenter linkage section is associated with the indenter, wherein the indenter linkage section is a movable section of a displacement sensor; a loading lever driving section provided on the other end side of the loading lever, which loading lever driving section turns the loading lever; a reference lever supported pivotally so as to have a shaft center which is approximately same as a shaft center of the loading lever; an indenter reference section provided on a lower surface of one end side of the reference lever, which indenter reference section is a positional reference of a tip portion of the indenter; an indenter position detection section provided on an upper surface of the one end side of the reference lever, which indenter position detection section detects a displacement amount of the indenter linkage section; a reference lever driving section provided on the other end side of the reference lever, which reference lever driving section turns the reference lever; a stopper to stop the reference lever so that the indenter reference section is in a predetermined position with respect to the specimen surface; a control section (200, 232) configured to, by using the loading lever driving section, turn the loading lever from the state that the indenter reference section touches the specimen surface, and to measure a first indentation depth amount at the time when the indenter touching the specimen surface is pressed against the specimen by detecting the displacement amount of the indenter linkage section with the indenter position detection section; and the control section (200, 234) further being configured to, by using the loading lever driving section, turn the loading lever from the state that the reference lever touches the stopper and the indenter reference section is spaced apart from the specimen surface, and to measure a second indentation depth amount at the time when the indenter touching the specimen surface is pressed against the specimen, characterized in that the control section (200, 235) is further configured to obtain a machine frame compliance of the indentation testing instrument by subtracting the first indentation depth amount from the second indentation depth amount. a loading lever supported pivotally; an indenter provided on a lower surface of one end side of the loading lever; an indenter linkage section provided on an upper surface of the one end side of the loading lever, which indenter linkage section is associated with the indenter, wherein the indenter linkage section is a movable section of a displacement sensor; a loading lever driving section provided on the other end side of the loading lever, which loading lever driving section turns the loading lever; a reference lever supported pivotally so as to have a shaft center which is approximately same as a shaft center of the loading lever; an indenter reference section provided on a lower surface of one end side of the reference lever, which indenter reference section is a positional reference of a tip portion of the indenter; an indenter position detection section provided on an upper surface of the one end side of the reference lever, which indenter position detection section detects a displacement amount of the indenter linkage section; a reference lever driving section provided on the other end side of the reference lever, which reference lever driving section turns the reference lever; a stopper to stop the reference lever so that the indenter reference section is in a predetermined position with respect to the specimen surface; a control section (200, 232) configured to, by using the loading lever driving section, turn the loading lever from the state that the indenter reference section touches the specimen surface, and to measure a first indentation depth amount at the time when the indenter touching the specimen surface is pressed against the specimen by detecting the displacement amount of the indenter linkage section with the indenter position detection section; and the control section (200, 234) further being configured to, by using the loading lever driving section, turn the loading lever from the state that the reference lever touches the stopper and the indenter reference section is spaced apart from the specimen surface, and to measure a second indentation depth amount at the time when the indenter touching the specimen surface is pressed against the specimen, characterized in that the control section (200, 235) is further configured to obtain a machine frame compliance of the indentation testing instrument by subtracting the first indentation depth amount from the second indentation depth amount.