Abstract: A wall-type safe provided with a main parallelepiped body defining therein a main storage chamber, the front side of the body being closed by a swingable door. One of the walls of the body has an enlarged opening formed therethrough, which wall exteriorly thereof has a pair of opposed guide flanges extending along opposite sides of the opening. A boxlike compartment which is open at one end, is provided with flanges along the open end which slidably engage the guide flanges on the body for connecting the compartment thereto, whereby the compartment defines therein a secret chamber accessible solely from the main chamber. An interior wall is disposed in the main chamber and overlies the opening for covering and closing same, which interior wall is removable when access to the secret chamber is desired.