Purpose: This paper presents results of investigation of structure and magnetic properties of Fe56Co7Ni7B20Nb10metallic glasses prepared from industrial raw materials. The investigated samples were cast in form of the ribbons. Ribbons were prepared by the single copper roller melt spinning method. The casting conditions include linear speed of copper roller: ν = 18 and ν = 20 m/s and ejection over-pressure of molten alloy: p = 0.02 MPa. Design/methodology/approach: The structure was characterized by X-ray diffraction (XRD) method, transmission electron microscope (TEM), scanning electron microscope (SEM). The magnetic properties contained, coercive force Hc, initial magnetic permeability μiand magnetic after-effects Δμ/μ measurements were determined by the coercivemeter and with the use of automatic device for measurements magnetic permeability, respectively. Magnetic hysteresis loops were measured with a vibrating sample magnetometer (VSM) under an applied field up to 2 T. Magnetic properties of saturation magnetization – Mswas determined from achieved magnetic hysteresis loops. Hysteresis loops, recorded using a computer controlled DC hysteresis loop tracer, were used to obtain hysteresis parameters. Findings: The XRD and TEM investigations revealed that the studied ribbons were amorphous. The SEM images showed that studied fractures morphology of ribbons is changing from smooth fracture inside with few veins network in surface freely solidified (shining surface). Character of fracture morphology revealed ductile character of Fe56Co7Ni7B20Nb10ribbons with vein pattern morphology, typical for amorphous alloys. The detailed analysis of data of magnetic properties i.e. Ms. Μiand Hcallow to classify the alloy in as quenched state as a soft magnetic material. Research limitations/implications: The results can give more details to understand the relationship between structure and magnetic properties. Thus can be useful for practical application of these alloys. Practical implications: The Fe, Co, Ni-based metallic glasses due to their properties such as excellent magnetic properties are the most attractive and promising for the future applications as new prominent class of engineering and functional material. Thin ribbons of magnetic metallic glasses are currently used in transformer cores, in magnetic sensors, and for magnetic shielding. Higher thicknesses would be useful particularly for the latter two applications. Originality/value: The applied investigation methods are suitable to determine the changes of structure and soft magnetic properties of examined Fe56Co7Ni7B20Nb10metallic glasses with function of sample thickness.